I am totally apolitical person. I do not ever know who is the current president in the country I live (Austria), so... brexit or whatever is out of my scope of interests.
My concern is, that apparently web-forums like this one, would need to pay lawyers and compile the documentation/rapports needed to not get a lawsuit in UK against them.
If you took a look at the HaikuOS forum, you've probably seen that they are considering geo-blocking the UK users from the forum as the simplest method of compilance with the act.