At this point, what's the difference between the UK and China other than the specific content they block? Some ISPs have even started blocking wireguard here & I've had to resort back to xray/v2ray

Very little difference. But blocking wireguard is huge change, which ISPs are doing that?

I currently live in student accommodation so not sure what they're using upstream. The university network also drops wireguard connections but only to known providers like Mullvad (assuming obfuscation is off)

You may have some success with DPI bypass tools we've been using in Russia for years now, like GoodbyeDPI and Zapret.

Is that common for all ISPs or just Virgin? When I lived in the UK (already a number of years ago) it was all just DNS-based. Running my own DNS resolver unblocked everything. I don't recall which ISP.

I think it's just Virgin doing the SNI stuff, but I wouldn't be surprised if others are doing IP filtering. I'm not sure if anyone's done a good survey of what the different ISPs are doing (it'd be an interesting project).

TalkTalk, Sky, BT & pretty much all domestic mainstream ISPs do DPI down to SNI.

They also exercise an IWF proxy so your already MiTM'd.

https://www.iwf.org.uk/