There's at least two Cybertrucks in the UK right now, but one of those was a foreign national who had it seized for some reason. Think they're still in a legal grey area though and you have to jump through a few hoops to have them legally on the road.
I think that cybertuck is not road legal in the UK (I mean I expect it's same as in the EU).
So the only way it could be there on the road would be that it's still registered somewhere where it's legal (most probably the US) and take some risks (and maybe some bribes here and there), since not every police officer knows the law perfectly and you can get away a couple of times, probably, especially if seen as a tourist.