GDS gets lots of love here but if you actually try and use the pages for things like HMRC and Companies House you quickly find it's lipstick on a pig and some horrible mess of legacy systems underneath with lots of bugs.

For example, if I want to update company information, the wizard type thing for it rejects my auth. If I use it's password reset function, it successfully changes my password but then rejects my new auth. Instead I have to find a log-in page for an entirely unrelated action and then navigate from there to the page that will let me edit what I need.

I reported it and they just gave some flannel that it was a temporary fault but it still behaves like this years later. The system is crap and their response to bug reports is crap too.