I have been recommended a plumber to fit a new gas CH boiler. He has quoted for the work and all seemed well, but i thought I would check his CORGI registration. I checked his name on the CORGI web site and could not find him listed. When I asked him, he gave me a registration number but said he was not currently listed as he was undergoing training to achieve a certain qualification. Isn't it illegal though to do gas work whilst not currently CORGI registered ? Thanks for any guidance.