Archimedes,
WHL did indeed have a Blackhawk licence from Sikorsky, but they never built any for the UK and I'm pretty sure the licence has now expired, perhaps partly to do with the severing of the long standing WHL/Sikorsky relationship a few years ago.
Cheers,
VP
[Edited to add (posts crossed...):
I knew that SS, but the fact remains that the UK never purchased or operated a Blackhawk]