Blast from the past... holy thread revival batman!
Must have been a good 2 and a half months before it was gone. I put up with it for a while but I did try and get under the floor at one point to see if I could find it, but the hole in the outside wall was not large enough and there was a fairly large void with rubble so couldnt find / get to it.
Terrible smell it was!
Moral of the story is, if you are going to poison rats, dont block any entrances and dont have a floor you cant take up!