Bristow did in fact have three axis autopilots....Bell Scas...Sperry Helipilots....and that wonderful French piece of crap SFENA. Helipilots by far the better of the three....although when the Bell SCAS was tuned and working right...it was very handy. On the North Sea, the machines had the coupled Flight Director for the Sperry which makes for a very nice setup. Upon being dispatched to Nigeria and other parts of the world....the Coupled Flight Director modules were removed (afterall who is going to pay for them old chap?).
You might seek "212man's" input.....although he is now the EC-155 TRE for Bristow....he might help you out a bit. The best source of info would be Peter Barnes, who was exiled to Scatsta upon falling from grace with the BHL management. He was the Senior Type training captain on the 212 for years and is a very professional pilot. Bob Jones, ex-BHL, now with the CAA would be another good source of information.