Sucks, I had something like this happen to me with a second hand Audi. Turbo exploded after 3 months but luckily it was still under warrenty. Then the exact same thing happened to a friend, also with an Audi :/ But yea, the Rover k series is known for head gasket failure, among other things. It even happens on the S1 Lotus Elise which uses the same engine (which is why many owners replaced the engines with Honda units). I don't think it's to expensive to fix, if that is the only problem. But it can take other parts of the engine with it when it blows, which means a whole new engine.