Identifying where the fault was that tripped the RCD box and cut off all the electricity

Magnificent. It was a fault with the electrics in the boiler. He located the problem and then phoned a gas engineer to confirm his diagnosis. After which he “coached” me in what to say to British Gas but also made him self available for the BG engineer were it required. I suffer from Parkinsons and I was quite agitated but his whole demeanour calmed down my fears. Thank you John, you are a star.