Last night I was driving home, I got to a roundabout and pulled away in first, it wasn't the fastest pulling away but I went to change to 2nd at around 3000rpm and heard a loud bang and grind noise, the car popped out of gear and came to a stop, when I tried starting it again, it wasn't having any of it when i tried to it would even attenpt to fire, there was just a nasty knocking noise from the engine. I called my breakdown cover and they came to tow the car, the bloke thought it was either the cambelt snapping or the timing belts slipped. There was also some oil in the water which he reckons could be head gasket problems but there was no large amounts of smoke coming from the exhaust, it's going in to be looked at today but I was just wondering if this has happened to anyone before or if they may have any idea what it could be? Any help would be much appreciated