strange squeaky click noise

hello, a strange noise has begun to occur when i'm accelerating. sort of a squeaky click that sounds like its coming from the gearbox area. i thought it might be from a wheel bearing but it stops when cruising in neutral. any ideas? i've always had a noisy gearbox but this is a new sound and i don't like it.
john

how about the cam belt tensioner, under the plastic cover on the side of the engine?

i had that, caused my cam belt to snap in the end as i couldn't work out what it was in time...

kine of sounds like alternator belt sliiping sound but not as loud...

yeah, after reading of other similar problems on the forum i did consider the tensioner. would it account for not happening when diving in neutral? i'll get it checked out at the weekend. thanks peterainbow.