Was going to suggest these too. Mrs Z has used them before on the recommendation of her friend and all was good 
Actually, as I recall I went to pick her up from there when she dropped her car off, we then got in my car which then promptly broke down too. They brought the diagnostics tool thing out, realised it was an electrical problem and said “you’re in luck, the auto electrician’s in the garage at the moment.” He came out, worked on it for ages, sorted out the problem and none of them would take a penny for it. GBoLs indeed.