"have been contacted by GEM offering to sell some reg - s shares for me I foolishly purchased 2 years ago through a boiler room."

Global Equity Management have been mentioned on the "Environmental Living-Green Fools" board:

http://boards.fool.co.uk/Message.asp?mid=9629914&sort=whole#10446411


"I assume this is a scam and that if I send my certificate ( and presumably a fee) that I will see no money at all.( not that the shares are worth much anyway )

can any one confirm or otherwise"

Yes, trust your instincts and read this board's FAQ:

http://boards.fool.co.uk/Message.asp?mid=10212932

In particular follow the link to:

"Worthless Stock: How to Avoid Doubling Your Losses"
http://www.sec.gov/investor/pubs/worthless.htm

PD