Here's a link to the AA site. They don't mention a price just "For a small fee we will make sure you don’t pay the price at the end of the day." Everything, I suppose, is relative to the purchase price.
[broken link removed]
Incidentally, I used the AA about 15 yrs ago and the fee then was about 130. They gave the car a relatively clean bill of health and any faults they found, the garage fixed (the fixing cost more than the inspection). The garage was surprised when I said I wanted the AA to check out the car, as they said that they would stand over any anything that went wrong, (during the guarantee period anyway) but being the awkward ba%^&& that I am, I insisted on the AA check. Anyway, as your mate is already selling the car at an exellent price, minor repairs would be up to the purchaser.
Prior to buying that car, I went into a main dealer on the SCR who had a VW Golf that he said had just come in and was for sale. The car was fillthy - no problem. It had UK plates- no problem. Genuine mileage and had never been crashed we were assured by the salesman. Again I said that I wanted an AA report. He said that it wasn't necessary as they were a major franchised dealer (not a VW dealer) and would sort out any problems that arose and that he didn't forsee any. He encouraged us to take the car for a test drive which we did. We liked the car. We started to haggle and more or less agreed on a price. I said then said that I was adamant that I wouldn't part with 5-6000 (a lot of money then) without an AA check. Again, I was told it wasn't necessary but I insisted that it was. The salesman went off with himself and came back 10 minutes later and said that the car was sold. I have no doubt whatsoever that there was something dodgy with that car. It must have been had either been crashed or clocked or both or had some major defect in the offing that wouldn't have shown up for a couple of months.
Murt