Regulation 8 Existing gas fittings
(1)
No person shall make any alteration to any premises which would adversely affect the safety of a gas fitting or a gas storage vessel in such a manner that, if the fitting or the vessel had been installed after the alteration, there would have been a contravention of, or failure to comply with, these Regulations.
(2)
No person shall do anything which would affect a gas fitting or any flue or means of ventilation used in connection with the fitting in such a manner that the subsequent use of the fitting might constitute a danger to any person.