Like some have said get on & post on the GMTV site and put over your views I just posted the following which only happened today.

I run a local independent garage and today I had a classic example of a regular customer trying to save money. (Professional repairs are not cheap; the trade today requires expensive equipment & training) He returned to us today to fix an on-going starting problem that he explained he had done the rounds with small one man repairers trying to fix a bad starting problem all to no avail and asked if we could look at the problem.
Other repairers had changed parts on the ignition system and because they fitted cheap non genuine parts the last repairer had actually introduced a bad starting problem to the vehicle. It transpired these ignition coils had been charged out at the genuine manufacturers price and were the problem. Well we had to carry out an oscilloscope test on the ignition system to prove the problem and the customer stood and watched our diagnosis. He quickly realized that the coils were quickly & easily replaced, but I had to explain that the real value in the Motor Trade is not just guessing the problem but hooking up thousands of pounds worth of equipment and years of training and expertise to spot the correct problem. The bill he had from the last repairer was for several hundred pounds and all the parts & work had to be re-done with proper genuine parts, costing a similar amount of money including our further diagnosis work to prove the other repairers mistake.
The nub of what I am saying is you only get what you pay for these days and the guy could have saved hundreds of pounds and weeks of frustration even though he knew of a reliable garage, but he perceived us as being expensive and chose the competition whose ability or qualifications to correctly repair his vehicle he knew nothing of and paid dearly for his experience. What is needed is a quality control system introduced by the government like plumbers & electricians so if you go else where you only have yourself to blame. Going cheap doesn’t mean you get value for money.