Blender supports cuda for much of its gpu work. It will work with amd. And there are projects allowing gpu rendering via amd. But they are (and have been for a while) a long way behind the cuda stuff.
For major rendering projects nvidia is still the fastest set up to use.
If asylum is claimed. It is illegal for the UK to reject it based on method of entry.
But they have to be legally in the UK for 10 years anyway. So this is a pointless change that never happened.