Hi Bazile,
I have used them once or twice in the past and found them to be a bit expensive and fault finding, when i can almost guarantee the problem is not there, so i dont use Halfords at all now.
We have our cars MOT'ed annually at JUST MOTS, which gives you an unbiased opinion on your car, as no garage or gain to be made there....just the MOT and how the car is inspected
......We have check-ups and services from a great local mechanic, that is used by a few of us in our cul-de-sac and he gives a great service and can pick up cars from home, and return them same day, subject to parts if required etc of course, if need be.
You know your car is getting what it needs........talking of which spookily, Mrs Bears EML light came on and off weekend and his diagnostics check spells to a throttle position sensor...on order as a whole body unit, as comes with idle control valve attached, which may be at fault too....two days to come in from Honda via Belgium :0)