cruk-pattern-library-api/components/designElements/spacing/spacing.html

CRUK Pattern Library API

<ul class="cr-list cr-list--unordered">
    <li class="cr-list__item">spacing between elements is usually 5px, 10px, 15px or multiples of 15px</li>
    <li class="cr-list__item">gutters are 15px for smaller screens and 30px for larger screens</li>
</ul>