You do know that snakes readily take frozen thawed food? Even in the wild if a snake comes across carrion they will eat it.
Eh, I had a quick check to get some facts before I just tried to blurt out something completely baseless like saying they're scavengers. Ireland having no snakes and Britain having "slow-worms" isn't much info to go on, y'know?
Britain has snakes too, like grass snakes and adders. Irelands kinda boring when it comes to reptiles.
This is not how you wash rats. (Animal abuse?)