They are way cheaper than that, more like 100 something pounds. And it's about an hour and a half job to do.
No just changing the oil won't cure it, they will need cleaning or replacing
That's good news cause I don't mind spending couple hundred pounds to sort it out. If I go for 3mm will it improve the performance of the car? If I wanted to do this myself how do I do it? I always wanted to know how to do bits and bats myself thanks guys a great relief for me to know