Maybe I should have said this already but the complex is not piped for gas. Nevertheless, I did call them out in case the neighbours had a free standing gas heater or something like that but it turned out that the smell was definitely not gas.
Basically I came home one day and thought I got a faint smell in the living room but ignored it. When I got home the next day I though the smell was getting stronger. But by day 3 it almost knocked me out when I opened the door. It took a couple of hours to get over the headache it created.
But since then it has thinned out again and at this stage it's a lingering smell. That's why I think it points to a dead 'something' under the floor boards... plus the fact that the floor boards were up for a few weeks for maintenance work and then resealed.
The smell came about a week after they were resealed. But at the same time I had the house painted so it could be that too.
I have called a maintenance guy out and he thinks that it's either a dead mouse or the paint put on the wall had 'gone off'. But he was really only guessing. I checked the paint tins and they are def. for interior use so it's not that the wrong paint type was used.
Rentokil didn't really have anything to say except to quote me 220 + vat to check it out.
Anyway - I'm thinking of getting the floorboards taken up to check for a dead body now but my question is if that is worth the trouble. Can I just ignore it at this stage as it seems to be disapating (slowly)? Is there any harm in having a dead carcass under the floor boards?