I went into a garage today and asked them to check if my wheels needed tracking or alignment. I was told it was slightly out so I told them to go ahead with it. £30.00 later I asked whether they have a printout of before and after (as some do). I did have a bit of a chat with them but made me wonder how can you know for sure if you have slight adjustments that they have actually done something if they don't give you printouts?