Car troubles

I've had a new lamda probe fitted...or, at least, my car has! What, you may ask, is a lamda probe? Well, for those of you who don't know, it is attached to your exhaust and monitors fuel emissions. I learned something new there! More importantly, it cost me £235 to have it replaced- I think I've been had. At least my car got a complimentary valet...perhaps the real reason for the expense was that my car was so dirty!