Sorry, try the UKSA at Cowes. Alison(?) Bradbeer runs a Sigma 38 and is a good skipper but I do not know if she will take a charter out or what she would charge. If she won't do it she might know someone who will. ? indicates I am not totally sure of her name but I do know she has the Sigma.
Best of luck,
Short of that you'll have to do a 'Some Like it Hot' routine
Try asking for Lucy at BOSS (023 8045 7733), www.boss-sail.co.uk. She is a pro instructor (V good)though - so she will charge, but she might do a good private rate for just skippering.
madlins@yahoo.co.uk (ignore the 'mad' bit), is a yachtmaster, great personailty. 30's, non-smoker, Cowes based, Atlantic crossing etc, and always looking for a sail - but don't tell her I sent you.
Quite a few years ago a wife of a a friend attended a Ladies only week of cruising and wrote it up in PBO. Probably 1997. I believe it was run by BOSS.