John turned up and looked at the problem mirror - turned out it needed a special part,and he e-mailed the manufacturer Roper Rhodes who sent the part gratis. John had to go to USA for a couple of weeks on family business, but he contacted me from there to see if the part had been delivered.
He turned up today and finished the job,all working now. He had also found the time to fit a fluorescent tube under a kitchen cabinet.
Communications great, timekeeping great, and very clean workmanship. His number stays in my book for future reference.
Thanks John, most impressive.