MasterChef has gone the same way.
Like you would never get a Reality TV Show in America where half of the contestants aren't American, yet you can get pretty close to that on newer seasons of MasterChef UK.
I can't speak for BGT, but I can believe it.
And imo it's not racist for saying that most of the contestants in a UK edition should be from the UK, I mean how bigoted of us to use common sense, ain't that right Kate.