I have had the same thought, we moved to SE23 (near Perry Vale) 6 months ago. Since moving here our lovely 5 year old cat came home VERY sick 3 times in around 4 months; vomiting and looking really spaced out. Unfortunately the last time it happened he couldn't cope with the sickness and died. Our vet too suspected some kind of poisoning. I also notice the amazing amount of 'missing cat' posters around the area, far too many!!! I miss my little cat terribly, certainly won't be getting another one until I move away from SE23!!