Well you won`t get any advice from me because I never did gas after corgi was introduced I`m an old fart lead bashing floorboard ripping plumber that`s retired thank fnuck But here`s the rub..........When I left school in 1970 I was offered a choice of gas fitter with BG or plumber with a local firm .......indentured C+G......biggest mistake of my life I would`ve caught the sellout , shares and a big redundo payout££££££...............So I say The best of luck to you , sincerely.........but think hard about self employed ....there`s a long thread on it`s pros+cons in the archive