we had rats living in the bank. took a couple of hits with poison pouches to eradicate them. I am sure they are gone now as this summer the bank has grown back green.
They did go in the daleks tho.. there inside we found the empty poison pouches. They had taken them inside the dalek by burrowing underneath.
Last year I moved my daleks and placed them on a bed of 4 really large concrete slabs. The worms managed to get thro the small gaps between and I have used one lot of compost.. is working a treat now.
Can also recommend Townex pouches of rat poison, I got mine on ebay and they are better than having to try and keep loose stuff dry. Also contained so the other wildlife etc cant get at it. Hated having to do it but they were too d**n close to the back door!