anchor.diff:    <header>
       <h1 class="heading-large"><a href="<%= sections_path %>">Trade Tariff: look up commodity codes, duty and VAT rates</a></h1>
     </header>
  -  <%= form_for @search, method: :get, url: perform_search_path, html: { class: "tariff-search #{@section_css}", id: "new_search" } do |f| %>
  +  <%= form_for @search, as: '', method: :get, url: perform_search_path, html: { class: "tariff-search #{@section_css}", id: "new_search" } do |f| %>
       <div class="grid-row">
         <div class="column-two-thirds">
           <div class="search-header js-search-header">
  
positive.code:   <header>
      <a class="back-to-previous" href="<%= @back_path %>">Back <span class="visuallyhidden"> to the list of commodities</span></a>
      <h1 class="heading-large">Commodity information</h1>
      <%= form_for @search, method: :get, url: perform_search_path, html: { class: "tariff-search #{@section_css}", id: "new_search" } do |f| %>
        <div class="grid-row">
          <div class="column-full">
            <div class="search-header">
  
negative.code:             <fieldset class="search-input">
                <%= f.label :q, "Search the tariff", class: 'form-label' %>
                <%= f.select :q, [f.object.q], { name: 'q', selected: f.object.q }, class: 'js-commodity-picker-select form-control' %>
              </fieldset>
              <fieldset class="search-submit">
                <%= f.button 'Search', class: 'button' %>
  