Posted: 29/07/2014 at 20:51
Rats love concrete - they tunnel into the hardcore that the concrete is laid over, and make warrens under the concrete that no one can get at.
There's no need to panic - practice good garden hygiene - no cooked food in the compost. I wouldn't put potato peelings in there either - rats love potatoes. Make sure there's no bird seed spilled on the ground and bring the feeders in at dusk. If they climb up onto bird tables use the metal shepherd's crook pole-type hangers. My daughter's found the rats that were feeding from her bird feeders cannot do it any more now she uses the metal poles.
Also ensure that concrete around drains and manholes is well-maintained.
If next door are still seeing rats then pest control need to visit again - they will get rid of them.