[notoverthere]

Which animations are you referring to? I don't think I can find any components with animations in the GOV.UK Design System <https://design-system.service.gov.uk/>.

Likewise for underlines on headings – I can't see that in the style guide.

[AtNightWeCode]

The animation when you click links. I was thinking that they are dogfooding and the blog has those types of headings.