I recently bought a second hand BMW X3 from a Vauxhall dealership. It's a 2008 model, with 50,000 miles and full service history. Within the first week of ownership I had problems with the tyre monitoring sensor, glow plugs, EGR valve, oil sensor. Water was also leaking into the boot and rear near side footwell.

I took the car back and after chasing them up after two days I was told they'd handed it over to a BMW specialist. The car is still with them and more than a week has passed and the dealer says they haven't fixed it.

What is my legal standing and how do I make sure they fix the car properly and give it back ASAP? I paid £11,000 for it and deliberately went to a main dealer to avoid the precise problems I'm now experiencing.