Might be useful to find out where abouts in the garden they get all the damn mice from. Went downstairs at about 10pm, find them trying to get at a mouse they bought in behind cupboard, queue sticking them in frontroom with door shut wiating for mouse to come out to catch it and get it out. GOt rid of that one, went to let them out, found them chasing yet another mouse, they had obviously earlier bought in and let get away in there, move them to a different room again. Caught mouse took it out, another mouse in the damn hall that came out of no where.
Its very obvious when we've forgotten to feed them aswell, fed them normally, all the mice that turn up our alive and just being chased around, forget a meal, the mice that turn up are dead and they try to eat them.