diff --git a/app/components/bulk_upload_error_row_component.html.erb b/app/components/bulk_upload_error_row_component.html.erb
index 54a2c6c93..edf480a1a 100644
--- a/app/components/bulk_upload_error_row_component.html.erb
+++ b/app/components/bulk_upload_error_row_component.html.erb
@@ -1,13 +1,13 @@
-<div class="x-govuk-summary-card govuk-!-margin-bottom-6">
-  <div class="x-govuk-summary-card__header">
+<div class="govuk-summary-card govuk-!-margin-bottom-6">
+  <div class="govuk-summary-card__title-wrapper">
     <% if lettings? %>
-      <h3 class="x-govuk-summary-card__title"><strong>Row <%= row %></strong> <%= tenant_code_html %> <%= property_ref_html %></h3>
+      <h3 class="govuk-summary-card__title"><strong>Row <%= row %></strong> <%= tenant_code_html %> <%= property_ref_html %></h3>
     <% else %>
-      <h3 class="x-govuk-summary-card__title"><strong>Row <%= row %></strong> <%= purchaser_code_html %></h3>
+      <h3 class="govuk-summary-card__title"><strong>Row <%= row %></strong> <%= purchaser_code_html %></h3>
     <% end %>
   </div>
 
-  <div class="x-govuk-summary-card__body">
+  <div class="govuk-summary-card__content">
     <%= govuk_table do |table| %>
       <% table.head do |head| %>
         <% head.row do |row| %>
diff --git a/app/components/check_answers_summary_list_card_component.html.erb b/app/components/check_answers_summary_list_card_component.html.erb
index 1a807640b..a2fad6445 100644
--- a/app/components/check_answers_summary_list_card_component.html.erb
+++ b/app/components/check_answers_summary_list_card_component.html.erb
@@ -1,12 +1,12 @@
 <% if applicable_questions.first %>
-  <div class="x-govuk-summary-card govuk-!-margin-bottom-6">
+  <div class="govuk-summary-card govuk-!-margin-bottom-6">
     <% if applicable_questions.first.check_answers_card_number != 0 && applicable_questions.first.check_answers_card_number.present? %>
-      <div class="x-govuk-summary-card__header">
-        <h3 class="x-govuk-summary-card__title"><%= check_answers_card_title(applicable_questions.first) %></h3>
+      <div class="govuk-summary-card__title-wrapper">
+        <h3 class="govuk-summary-card__title"><%= check_answers_card_title(applicable_questions.first) %></h3>
       </div>
     <% end %>
 
-    <div class="x-govuk-summary-card__body">
+    <div class="govuk-summary-card__content">
       <%= govuk_summary_list do |summary_list| %>
         <% applicable_questions.each do |question| %>
           <% summary_list.row do |row| %>
diff --git a/app/views/form/_interruption_screen_question.html.erb b/app/views/form/_interruption_screen_question.html.erb
index a37254d1e..73c355588 100644
--- a/app/views/form/_interruption_screen_question.html.erb
+++ b/app/views/form/_interruption_screen_question.html.erb
@@ -3,8 +3,8 @@
 <h1 class="govuk-heading-m">
   Make sure these answers are correct:
 </h1>
-<div class="x-govuk-summary-card govuk-!-margin-bottom-6">
-  <div class="x-govuk-summary-card__body">
+<div class="govuk-summary-card govuk-!-margin-bottom-6">
+  <div class="govuk-summary-card__content">
 
     <%= render partial: "form/check_answers_summary_list", locals: {
         lettings_log:,
diff --git a/app/views/form/review.html.erb b/app/views/form/review.html.erb
index 9a94059e4..39682362d 100644
--- a/app/views/form/review.html.erb
+++ b/app/views/form/review.html.erb
@@ -14,11 +14,11 @@
       <h2 class="govuk-heading-m"><%= section.label %></h2>
       <% section.subsections.map do |subsection| %>
         <% if total_applicable_questions(subsection, @log, current_user).any? %>
-          <div class="x-govuk-summary-card govuk-!-margin-bottom-6">
-            <div class="x-govuk-summary-card__header">
-              <h3 class="x-govuk-summary-card__title"><%= subsection.label %></h3>
+          <div class="govuk-summary-card govuk-!-margin-bottom-6">
+            <div class="govuk-summary-card__title-wrapper">
+              <h3 class="govuk-summary-card__title"><%= subsection.label %></h3>
             </div>
-            <div class="x-govuk-summary-card__body">
+            <div class="govuk-summary-card__content">
               <%= render partial: "form/check_answers_summary_list", locals: { subsection:, questions: total_applicable_questions(subsection, @log, current_user), referrer: "check_answers" } %>
             </div>
           </div>
diff --git a/spec/features/form/check_answers_page_lettings_logs_spec.rb b/spec/features/form/check_answers_page_lettings_logs_spec.rb
index 5506e53b1..9ff419f93 100644
--- a/spec/features/form/check_answers_page_lettings_logs_spec.rb
+++ b/spec/features/form/check_answers_page_lettings_logs_spec.rb
@@ -148,14 +148,14 @@ RSpec.describe "Lettings Log Check Answers Page" do
 
     it "does not group questions into summary cards if the questions in the subsection don't have a check_answers_card_number attribute" do
       visit("/lettings-logs/#{completed_lettings_log.id}/household-needs/check-answers")
-      assert_selector ".x-govuk-summary-card__title", count: 0
+      assert_selector ".govuk-summary-card__title", count: 0
     end
 
     context "when the user is checking their answers for the household characteristics subsection" do
       it "they see a separate summary card for each member of the household" do
         visit("/lettings-logs/#{completed_lettings_log.id}/#{subsection}/check-answers")
-        assert_selector ".x-govuk-summary-card__title", text: "Lead tenant", count: 1
-        assert_selector ".x-govuk-summary-card__title", text: "Person 2", count: 1
+        assert_selector ".govuk-summary-card__title", text: "Lead tenant", count: 1
+        assert_selector ".govuk-summary-card__title", text: "Person 2", count: 1
       end
     end
 
diff --git a/spec/features/form/check_answers_page_sales_logs_spec.rb b/spec/features/form/check_answers_page_sales_logs_spec.rb
index 5c9e9b65c..3e851ba69 100644
--- a/spec/features/form/check_answers_page_sales_logs_spec.rb
+++ b/spec/features/form/check_answers_page_sales_logs_spec.rb
@@ -36,33 +36,33 @@ RSpec.describe "Sales Log Check Answers Page" do
 
     it "does not group questions into summary cards if the questions in the subsection don't have a check_answers_card_number attribute" do
       visit("/sales-logs/#{completed_sales_log_joint_purchase.id}/household-needs/check-answers")
-      assert_selector ".x-govuk-summary-card__title", count: 0
+      assert_selector ".govuk-summary-card__title", count: 0
     end
 
     context "when the user is checking their answers for the household characteristics subsection" do
       context "and the log is for a joint purchase" do
         it "they see a separate summary card for each member of the household" do
           visit("/sales-logs/#{completed_sales_log_joint_purchase.id}/#{subsection}/check-answers")
-          assert_selector ".x-govuk-summary-card__title", text: "Buyer 1", count: 1
-          assert_selector ".x-govuk-summary-card__title", text: "Buyer 2", count: 1
-          assert_selector ".x-govuk-summary-card__title", text: "Person 1", count: 0
-          assert_selector ".x-govuk-summary-card__title", text: "Person 2", count: 0
-          assert_selector ".x-govuk-summary-card__title", text: "Person 3", count: 1
-          assert_selector ".x-govuk-summary-card__title", text: "Person 4", count: 1
-          assert_selector ".x-govuk-summary-card__title", text: "Person 5", count: 1
+          assert_selector ".govuk-summary-card__title", text: "Buyer 1", count: 1
+          assert_selector ".govuk-summary-card__title", text: "Buyer 2", count: 1
+          assert_selector ".govuk-summary-card__title", text: "Person 1", count: 0
+          assert_selector ".govuk-summary-card__title", text: "Person 2", count: 0
+          assert_selector ".govuk-summary-card__title", text: "Person 3", count: 1
+          assert_selector ".govuk-summary-card__title", text: "Person 4", count: 1
+          assert_selector ".govuk-summary-card__title", text: "Person 5", count: 1
         end
       end
 
       context "and the log is for a non-joint purchase" do
         it "they see a separate summary card for each member of the household" do
           visit("/sales-logs/#{completed_sales_log_non_joint_purchase.id}/#{subsection}/check-answers")
-          assert_selector ".x-govuk-summary-card__title", text: "Buyer 1", count: 1
-          assert_selector ".x-govuk-summary-card__title", text: "Buyer 2", count: 0
-          assert_selector ".x-govuk-summary-card__title", text: "Person 1", count: 0
-          assert_selector ".x-govuk-summary-card__title", text: "Person 2", count: 1
-          assert_selector ".x-govuk-summary-card__title", text: "Person 3", count: 1
-          assert_selector ".x-govuk-summary-card__title", text: "Person 4", count: 1
-          assert_selector ".x-govuk-summary-card__title", text: "Person 5", count: 1
+          assert_selector ".govuk-summary-card__title", text: "Buyer 1", count: 1
+          assert_selector ".govuk-summary-card__title", text: "Buyer 2", count: 0
+          assert_selector ".govuk-summary-card__title", text: "Person 1", count: 0
+          assert_selector ".govuk-summary-card__title", text: "Person 2", count: 1
+          assert_selector ".govuk-summary-card__title", text: "Person 3", count: 1
+          assert_selector ".govuk-summary-card__title", text: "Person 4", count: 1
+          assert_selector ".govuk-summary-card__title", text: "Person 5", count: 1
         end
       end
     end
diff --git a/spec/views/bulk_upload_lettings_results/show.html.erb_spec.rb b/spec/views/bulk_upload_lettings_results/show.html.erb_spec.rb
index 62da07d01..3dea3ce92 100644
--- a/spec/views/bulk_upload_lettings_results/show.html.erb_spec.rb
+++ b/spec/views/bulk_upload_lettings_results/show.html.erb_spec.rb
@@ -16,7 +16,7 @@ RSpec.describe "bulk_upload_lettings_results/show.html.erb" do
 
       fragment = Capybara::Node::Simple.new(rendered)
 
-      expect(fragment.find_css(".x-govuk-summary-card__title strong").map(&:inner_text)).to eql(["Row 10", "Row 14"])
+      expect(fragment.find_css(".govuk-summary-card__title strong").map(&:inner_text)).to eql(["Row 10", "Row 14"])
     end
   end
 
diff --git a/spec/views/bulk_upload_lettings_results/summary.html.erb_spec.rb b/spec/views/bulk_upload_lettings_results/summary.html.erb_spec.rb
index 242e58d4e..05e2dce85 100644
--- a/spec/views/bulk_upload_lettings_results/summary.html.erb_spec.rb
+++ b/spec/views/bulk_upload_lettings_results/summary.html.erb_spec.rb
@@ -16,7 +16,7 @@ RSpec.describe "bulk_upload_lettings_results/summary.html.erb" do
 
       fragment = Capybara::Node::Simple.new(rendered)
 
-      expect(fragment.find_css(".x-govuk-summary-card__title strong").map(&:inner_text)).to eql(["Row 10", "Row 14"])
+      expect(fragment.find_css(".govuk-summary-card__title strong").map(&:inner_text)).to eql(["Row 10", "Row 14"])
     end
   end
 
diff --git a/spec/views/bulk_upload_sales_results/show.html.erb_spec.rb b/spec/views/bulk_upload_sales_results/show.html.erb_spec.rb
index b553d27ce..785d830b3 100644
--- a/spec/views/bulk_upload_sales_results/show.html.erb_spec.rb
+++ b/spec/views/bulk_upload_sales_results/show.html.erb_spec.rb
@@ -16,7 +16,7 @@ RSpec.describe "bulk_upload_sales_results/show.html.erb" do
 
       fragment = Capybara::Node::Simple.new(rendered)
 
-      expect(fragment.find_css(".x-govuk-summary-card__title strong").map(&:inner_text)).to eql(["Row 10", "Row 14"])
+      expect(fragment.find_css(".govuk-summary-card__title strong").map(&:inner_text)).to eql(["Row 10", "Row 14"])
     end
   end
 
diff --git a/spec/views/bulk_upload_sales_results/summary.html.erb_spec.rb b/spec/views/bulk_upload_sales_results/summary.html.erb_spec.rb
index 4ac2e3807..6c00e5adf 100644
--- a/spec/views/bulk_upload_sales_results/summary.html.erb_spec.rb
+++ b/spec/views/bulk_upload_sales_results/summary.html.erb_spec.rb
@@ -16,7 +16,7 @@ RSpec.describe "bulk_upload_sales_results/summary.html.erb" do
 
       fragment = Capybara::Node::Simple.new(rendered)
 
-      expect(fragment.find_css(".x-govuk-summary-card__title strong").map(&:inner_text)).to eql(["Row 10", "Row 14"])
+      expect(fragment.find_css(".govuk-summary-card__title strong").map(&:inner_text)).to eql(["Row 10", "Row 14"])
     end
   end