If I were you Luke I would contact the environmental health & let them know. I contacted them last year & DEFRA when we thought someone was putting poison down (we found a few dead hedgehogs) I was really scared for my cats - DEFRA took it very seriously & came out & collected the dead hedgehogs for PM's. & said if it turns out to be poison they will investigate it until they find out who it is & what they are using & why.
Turns out the poor little hedgehogs had alchohol poisoning from all the apples that had fallen off the trees.
![Embarassed](images/smilies/icon_redface.gif)