Secondly, I've a massive issue with my mini, caused by me...
Any help would be greatly appreciated :)
After having a squealing mini for a couple if weeks, I had the belt checked and tightened, although it had already flattened the battery. I accidentally placed the jump leads the wrong way round on the points on my mini, whilst trying to charge the battery

Not sure what damage I've done but my stereo now doesn't work, there are two lights on the dash and although the battery is now charged (correctly) and the engine starts, I can only stop it by stalling him.
I guess I've frazzled something but can it be repaired??
I need to know where to start please...
Thanks in advance :)