Don't worry! I am not going with it!
The small print says that payments stop when it drops out of the top page, so I guess it comes down to 6x2 keywords per monthly fee and whether I think it is worth it?
Main concern is the possibility of proper damage to the rankings a year down the line if I leave them.
But in answer to my initial question, YES. you can find no win no fee
seo companies. But are they worth the risk..... hmmmmm