You dirty rat

Ive been wondering for a while why the birds have been giving the bird table in my patio a wide berth and now i know why.
The one thing i cant do is kill the rats , yes there is more than one its a breeding pair , so what i have done is removed the food source in the hope that they will go elsewhere to find food and when i return home next week all the gaps between the slabs and the wall will be filled in with quick drying cement mixed with broken glass to prevent them from digging their way back in.
I think its time Charlie the cat paid a return visit to see hid old grandad.