{% extends "withnav_template.html" %}
{% from "components/page-footer.html" import page_footer %}
{% from "components/form.html" import form_wrapper %}
{% from "components/back-link/macro.njk" import govukBackLink %}

{% block service_page_title %}
  Emergency alerts settings
{% endblock %}

{% block backLink %}
  {{ govukBackLink({ "href": url_for('.service_settings', service_id=current_service.id) }) }}
{% endblock %}

{% block maincolumn_content %}

  <div class="govuk-grid-row">
    <div class="govuk-grid-column-five-sixths">
      {% call form_wrapper() %}
        {{ form.channel(param_extensions={
          'fieldset': {
            'legend': {
              'isPageHeading': True,
              'classes': 'govuk-fieldset__legend--l'
            }
          }
        }) }}
        {{ page_footer('Continue') }}
      {% endcall %}
    </div>
  </div>

{% endblock %}

{% extends "withnav_template.html" %}
{% from "components/page-footer.html" import page_footer %}
{% from "components/form.html" import form_wrapper %}
{% from "components/back-link/macro.njk" import govukBackLink %}

{% block service_page_title %}
  Emergency alerts settings
{% endblock %}

{% block backLink %}
  {{ govukBackLink({ "href": url_for('.service_settings', service_id=current_service.id) }) }}
{% endblock %}

{% block maincolumn_content %}

  <div class="govuk-grid-row">
    <div class="govuk-grid-column-five-sixths">
      {% call form_wrapper() %}
        {{ form.channel(param_extensions={
          'fieldset': {
            'classes': 'govuk-!-margin-top-3',
            'legend': {
              'isPageHeading': True,
              'classes': 'govuk-fieldset__legend--l'
            }
          }
        }) }}
        {{ page_footer('Continue') }}
      {% endcall %}
    </div>
  </div>

{% endblock %}

Add vertical spacing above set channel h1
Add vertical spacing above set channel h1

To make it match other pages which use the legend
as the h1.
