[lwf]

Working without JS is still a core requirement of GDS sites; c.f. https://www.gov.uk/service-manual/technology/using-progressi...

and for more as to why: https://gds.blog.gov.uk/2013/10/21/how-many-people-are-missi...

[Someone1234]

In 2013.

They're now building sites to meet WCAG 2.1 which does support the usage of JavaScript for accessible users.