The left support on my seat has become 'loose'...it's not as supportive as it should be, and I don't think they're supposed to become unsupportive.

Can I have it replaced under warranty? I've already contacted my dealer and told him the problem, I'm taking my car in on Saturday to have that checked plus a noide coming from the engine when I accelerate.

I think it depends on whether you're a bit of a porker or not.

My Mrs used to have a Corsa and the seat became wobbly. When I took it in for a warranty repair the service guy looked at me and said he wasn't surprised. After picking himself up off the floor and re-arranging his bust nose the car was fixed up no problem