thanks for the reply, i got the doctor to sign the form anyway, at least if anything happens to it now they cant say i lied on the form or anythin, talked to the club i'm joining and they said its all fine and there isn't a problem.
knee is very stable now and i havent had any problem with it, i'm pretty much confident it will be fine (hope i'm not tempting fate here)
anyway got my first jump (static line) on 29th October so wish me luck!