[malsme]

To give some context for an otherwise abstract label? Like .ac.uk is likely to be a school or university, .gov.uk is something government related. To me, .co.uk is the wild west of the UK domains, so be a bit more guarded.

[hayksaakian]

Would .UK not serve the same purpose from your POV? It's the no-context UK domain, just like .com is the no context internet domain.

[justincormack]

there is some potential for confusion though. I imagine scammers would love .edu.uk for fake university sites...