I did a little research and these are the stats of foreign registered jet based in the UK and some Europe. By the way these are approximate figures.
US reg = 65 Jets
Bermuda reg = 21 Jets
Cayman reg = 15 Jets
IOM reg = 120 + Jets and continually growing
That's a total of 220 + foreign registered aircraft, one of whom must definetly need a Pilot
Davjet