The fire you have is very very reliable, needs very little servicing, unfortunately Aberdeen has a real problem getting Gas Engineers and the ones they do have tend to be of poor quality, as you are in a private let , you are at the bequest of your landlord, I know a good guy in your area , but quite rightfully, he wouldnt touch it without your landlords or letting agents request, it is not your fire it is theirs, did you do as previously asked and remove the lower panel of the fire ? it just pullsoff, only two simple clips, do that and take a pic of what is in there and post it on here