Having found that the "spare seats" type threads here and elsewhere have become a bit unwieldy, I have put a facility on
http://fly.dsc.net to allow people to record their interests in flight sharing of various types.
Find someone to lend some moral support for your first cross channel trip, a more experienced person to sit in the right hand seat whilst you shoot some approaches or offer a spare seat to a fly-in.
http://fly.dsc.net/u/Buddy