Hi Helen, as with the crankshaft, if the camshaft was broken the engine would'nt run or it would sound like an earthquake and the car would be un-drivable, I would take it to another garage for a second opinion and don't mention what the first garage mentioned, see if any friends or workmates can recomend a reputable independant garage, there are some good ones around!
It seems the first garage is playing on you being a Female with little or nil mechanical knowledge and are looking to fleece you
nigel
February 2010