It's funny though, don't you think? None of the other European countries have been blocked, and they have the exactly same GDPR and child protection law that the ICO claims it is pursuing.
I personally think that Imgur banned the UK for simple business reasons. We don't generate enough income for them to bother adhering to GDPR plus the OSA. As Europe presses ahead with similar censorship legislation I imagine it will ban them too, or any of those that do pursue it for GDPR breaches.
This is fragmenting the internet is of course is bad for everyone.
Frankly, it's a bloody weird thing to do unless medically required. Leave him be.