Some stats to put this in perspective.. the following is my current estimate of non-G-dash helicopters based in the UK by country of registration. This includes a handful which are on rebuild to flying status.
F = France = 2
HA = Hungary = 3 (more to come, eh, md600driver...)
LX = Luxembourg = 1
N = USA = 77
OY = Denmark = 1
S5 = Slovenia = 1
SE = Sweden = 1
VP-B = Bermuda = 3
YU = Serbia = 5
Total = 94