In general the gov.uk website is stellar. Lots of good info, and plenty of thought has gone into making everything clear, accessible and pleasing to the eye. Things generally work in a way that they really don't on most public org websites. The team behind it blog a fair bit about how they've made these things happen.
https://insidegovuk.blog.gov.uk
The only downside is that they often send you to sites run by other, significantly less competent bodies (looking at you, student loans company).