Extract a method

app/models/form/sales/pages/buyer_previous.rb

@@ -12,7 +12,7 @@ class Form::Sales::Pages::BuyerPrevious < ::Form::Page
   end
 
   def routed_to?(log, _current_user)
-    return false if log.staircase == 1 && log.form.start_year_after_2024?
+    return false if log.is_staircase? && log.form.start_year_after_2024?
 
     super
   end

app/models/sales_log.rb

@@ -477,4 +477,8 @@ class SalesLog < Log
   def nationality2_uk_or_prefers_not_to_say?
     nationality_all_buyer2_group&.zero? || nationality_all_buyer2_group == 826
   end
+  
+  def is_staircase?
+    staircase == 1
+  end
 end