We have had rats in the garden, on a couple of occasions, my neighbour had them in his garden shed, he caught about 4 in traps and then had the garden shed demolished......think any remaining ones have now camped in our dilapidated shed (which needs demolishing, but not happened yet !) The other day my daughter was taking pictures of the birds in the garden, and "ratty" comes along and pinches a full fat ball and proceeds to drag it under the fence...... daughter doesn't know but as soon as she was out of the house, hubby went out and put a block of rat poison under said fence.....hopefully it will do the trick, if not more poison will be purchased and distributed around the outskirts of the garden!!