Smart move
Some people call the SAS "Hallmark" troops ("When you care enough to send the very best."). Messing with them could be very unhealthy. As for the Gurkhas, I'm pleased to report they still serve with the British Army, only in smaller numbers than before. Here's a good article on them.
http://newsvote.bbc.co.uk/hi/english/uk/newsid_364000/364960.stm