The fucking stock market on the game is called BAWSAQ, without touching on the other hundreds of nods through the franchise to remind you it’s Scottish.
It is not touched by politicians because of the violence, not because it’s American.
The only thing British about Rockstar Games is that some of its employees are British, about 1/3rd.
The company is owned by US Take Two Interactive where all the profits are paid out (zero profits in the UK).
So you really can't celebrate it being British, because it isn't