What is a landlord's gas safety responsibilities? The Gas Safety (Installation and Use) Regulations 1998 require a landlord to ensure that any gas fitting (and any flue which serves any relevant gas fitting) is maintained in a safe condition.
The Health & Safety Executive (HSE) issued a safety letter in October 2008 regarding a potential risk regarding flues for gas boilers which were located in internal walls and which run through areas such as a ceiling void. Clearly such flues cannot be easily visually inspected.