JSFiddle - React, Tailwind, and code Playground

HTML

<div class="radio-spoof">
    <input type="radio" name="enquiry" value="General enquiry" class="radio"/>
    <div class="checked">hulk test</div>
</div>
<label for="general_enquiry">General enquiry</label>
<div class="radio-spoof">
    <input type="radio" name="enquiry" value="Request a brochure" class="radio" checked="true"/>
    <div class="checked">ironman test</div>
</div>
<label for="request_a_brochure">Request a brochure</label>

JavaScript

$(function() {
    $('.checked').hide();
    $('input').click(function() {
        if ($('input[type=radio]').is(':checked')) {
            alert('!')
            $(this).next('div').show();
        }
    });
});