Bit of a nasty hack but maybe better than deriving back link?

app/controllers/case_logs_controller.rb

@@ -59,13 +59,11 @@ class CaseLogsController < ApplicationController
     @case_log.page = params[:case_log][:page]
     responses_for_page = responses_for_page(@case_log.page)
     if @case_log.update(responses_for_page) && (@case_log.soft_errors.empty? || @case_log.soft_errors_overridden?)
-      @case_log.previous_page = @case_log.page
       redirect_path = get_next_page_path(form, @case_log.page, @case_log)
       redirect_to(send(redirect_path, @case_log))
     else
       page_info = form.all_pages[@case_log.page]
-      back_path = get_previous_page_path(form, @case_log.page, @case_log)
-      render "form/page", locals: { form: form, back_path: back_path, page_key: @case_log.page, page_info: page_info }, status: :unprocessable_entity
+      render "form/page", locals: { form: form, page_key: @case_log.page, page_info: page_info }, status: :unprocessable_entity
     end
   end
 
@@ -93,8 +91,7 @@ class CaseLogsController < ApplicationController
   form.all_pages.map do |page_key, page_info|
     define_method(page_key) do |_errors = {}|
       @case_log = CaseLog.find(params[:case_log_id])
-      back_path = get_previous_page_path(form, page_key, @case_log)
-      render "form/page", locals: { form: form, back_path: back_path, page_key: page_key, page_info: page_info }
+      render "form/page", locals: { form: form, page_key: page_key, page_info: page_info }
     end
   end
 
@@ -149,10 +146,4 @@ private
     end
     form.next_page_redirect_path(page)
   end
-
-  def get_previous_page_path(form, current_page, case_log = {})
-    return case_log.previous_page if case_log.previous_page
-    return request.referer.split("/")[-2..-1].join("/") if request.referer&.ends_with?("check_answers")
-    return form.previous_page(current_page) if current_page
-  end
 end

app/models/case_log.rb

@@ -44,7 +44,6 @@ class CaseLog < ApplicationRecord
   validates_with  CaseLogValidator, ({ page: @page } || {})
   before_save :update_status!
 
-  attr_accessor :previous_page
   attr_accessor :page
 
   enum status: { "not_started" => 0, "in_progress" => 1, "completed" => 2 }

app/views/form/page.html.erb

@@ -1,7 +1,11 @@
+<script>
+  if(performance.navigation.type == 2){
+     location.reload(true);
+  }
+</script>
+
 <% content_for :before_content do %>
-  <%= govuk_back_link href: "/case_logs/#{@case_log.id}/#{back_path}" do %>
-   Back
-  <% end %>
+  <%= link_to 'Back', :back, class: "govuk-back-link" %>
 <% end %>
 
 <%= turbo_frame_tag "case_log_form", target: "_top" do %>

spec/features/case_log_spec.rb

@@ -411,7 +411,7 @@ RSpec.describe "Test Features" do
         expect(case_log.override_net_income_validation).to be_nil
       end
 
-      it "clears the confirmation question if the amount was amended and the page is returned to using the back button" do
+      it "clears the confirmation question if the amount was amended and the page is returned to using the back button", js: true do
         visit("/case_logs/#{case_log.id}/net_income")
         fill_in("case-log-net-income-field", with: income_over_soft_limit)
         choose("case-log-net-income-frequency-weekly-field", allow_label_click: true)
@@ -422,7 +422,7 @@ RSpec.describe "Test Features" do
         expect(page).not_to have_content("Are you sure this is correct?")
       end
 
-      it "does not clear the confirmation question if the page is returned to using the back button and the amount is still over the soft limit" do
+      it "does not clear the confirmation question if the page is returned to using the back button and the amount is still over the soft limit", js: true do
         visit("/case_logs/#{case_log.id}/net_income")
         fill_in("case-log-net-income-field", with: income_over_soft_limit)
         choose("case-log-net-income-frequency-weekly-field", allow_label_click: true)