Thanks very much for the replies chaps.
Been on my hands and knees already Roger, I've smelled worse things in my time
Did manage to pin-point a certain spot right under the chair in the bursar's office, but didn't really get a definite location in the other room where it was really bad.
Interesting you had the same experience Colin, I was wondering about the ventilation issue. Two of these rooms have no windows, but the one I went in today where it's really bad had a big window that I kept open for a good couple of hours after cleaning, I also dried each of the carpets off with a fan immediately after cleaning.
I too wondered about backing/adhesive reaction but it hasn't happened anywhere else, I've cleaned another couple of acres of the same stuff in the building and it's fine. Only difference could be the adhesive the fitters used may not be the same in these rooms.
I'm going back in tomorrow afternoon, using the resources I have available. If that doesn't fix it then I'll have to re-evaluate the situation with them and come to some sort of an arrangement on what would be the best thing to do next.
P.S. David, rather you than me
I do actually have a customer whose colostomy bursts sometimes when he gets in/out of bed, I'm there every couple of months. Not the most pleasant side of our work but you have to take the rough with the smooth!