Blimey Nigel - lighten up - the only person that suggested anything was Keith - and he said 'call the professionals'. Apart from blushingsnail who suggested something was put down to gather evidence.

I think I'd call the council if I had an infestation, but if it's something coming through the cat flap, it's unlikely.

Elizabeth25, the best way to find out what's going on is to turn all the lights off and sit up high somewhere and wait where you can see the bowl. Then you'll see what's coming in and where it's coming from. It takes a little bravery, and patience, but it's the best way. Or set a video camera up.