When ever possible, stick with the forum mechanics, as they know our cars inside and out. From experience they are honourable and won't rip anyone off. I have a forum mechanic who is fully qualified and he has many years of experience. Yesterday, he completed ABS repairs, T4'd my 75 and then it passed its MOT. The 75 will be 21 next month and I have every confidence in the mechanic, Mr Anonymous
I was saddened to read the OP's experience, but sadly there are cowboys who give the trade a bad name, fortunately, they are in the minority.