Chris,
Winchman always used to be the realm of those who had previously gained some flying experience in other helicopter roles before volunteering to go SAR. At present it is not possible to apply for that specialisation alone.
As far as I know those (very few) crewmen who have been sent the direct route to SAR have extensive previous medical training, although it sounds as though you are qualified enough. Whether OASC will recognise your qualifications can only be found out one way. The one thing you may have to do is bite your tongue on occasions as through out training there will be those who, despite your previous employment, will simply refuse to admit that it is just possible that you know as much as they do and will do all they can to prove you still have a thing or two to learn.
To be honest, if I were you I'd seek employment in a similar field but outside the military where the experience you already have will be recognised as opposed to the RAF where on the whole only things you have done while serving will count. Sad but true.
[ 07 September 2001: Message edited by: Talking Radalt ]