Agree with you TWR but looking on this forum it is obvious that a large portion of drivers don't know much about driving or how a car works.
I did get one over on Kwikfit though !
Some time ago I got a new exhaust back box from kwik fit with a 2 year guarantee, It cost me £35, the exhaust got a small hole in it after 18 months, you could hardly hear it so I went back to Kwk fit and just asked them if I needed a new exhaust, of course they said yes. Asked them if they had one and could fit it then I showed them the gaurantee, They went in a huddle and got the manager because a new back box had gone up to £70.
They had to do it though!