And most with no nationality are British too you will find !
You have information not available to everyone else do you?
You're making an assumption is my guess, and it's not quantifiable. The numbers don't add up, because so many don't declare their nationality. You seem to be claiming those are mostly British, but I would argue that it's the non Brits that are more likely to want to hide their origin.
Yet you class then as foreign in your inaccurate figures !
The figures are precisely the results of the search I did. Which I also described, so you can do the same. No inaccuracy at all.
Up yours chum.