if its a council house check your tenancy agreement you'll find she will be in breech of it for letting her garden get in a state .... but be careful if you live in a council house discharging a firearm (air rifle) in a public place i know its your garden but (if your council) then your garden and the fence enclosing your garden technically belongs to the council you may also be in breech of your tenancy agreement also if while you shoot the rats you hit the fence that can (if they wanted to be picky) be classed as breech of the agreement because you have caused damage to council property...