Thanks for all responses this morning.
Yeah, under normal circumstances, I would either call the installer or the landlord but due family contention and the fact I was unhappy with the appearance of the gas fires installation and, as I’m not the one paying; my opinion counted for nothing, so I’m in no rush to call the installer.
Also, I don’t know how long the fire has to been on for the gas smell to occur.
When I arrive I will instantly detect the overwhelming odour of gas or if I happen to be upstairs I will eventually smell gas.
When I look at the fire; it’s lit and burning correctly and my Father has either turned the Fire up, but in between heat settings 3 & 4 or he has turned the fire off but turned the knob between the pilot light & heat setting 1 and just sitting there, oblivious to the smell.
In regard to the chimney, I don’t know whether it’s an open flue; it appears to be a series of hollow breeze blocks.
There’s no CO detector just smoke detectors fitted by the Fire Service.
In regard to the pilot flame; yeah, it remains lit because the fire is either on and in use or my Father turns the control knob to the pilot light position but when doing so, he tends to turn it between the pilot light and position 1 and it’s this “half state” position, which I believe is the cause; but should using it in such a manner allow gas to escape ?