Today when i took my car from the lockup, i heard a small rattling noise, so i opened the bonnet and the engine was shaking a bit. Now i've never had the bonnet open whilst the engine is running yet, so is this normal? I don't think it is. Called SEAT assistance out and getting them to check it over. I'm thinking it might be a loose engine mount or something like that? It's when the engine is ticking over and when it's revved that you hear the rattling/vibrating noise. It still drives fine and there's no loss of power or anything obvious. I'm just back from a 900 mile round trip to Brands Hatch and back and i never heard it then. Only today. I'm a bit concerned. Everything seemed to be going fine until today.