Mice - nicking poison trays!

I think mice may be the critters I have in the greenhouse - as this is for the second time in a week that the seedlings I bought have been decimated:





That stalk in the last photo is/was a tomato seedling.... never seen a slug nor snail do that, ever.

We've also had more damage (looks like chewed plasterboard) in the outhouse overnight so I now have three trays of poison in there and will keep going until it stops being taken. Once I win that battle, the whole room is getting ripped out so I can repair damage, redecorate and recarpet.

 

This is the first year, in 15 years here, that we've had this issue in the greenhouse - there is a fair bit of building work going on around us though, so I wonder if they've been displaced somewhere and taken refuge here. We have had the odd mouse in the past, but nothing to this level. The outhouse, I am convinced that is a rat or rats - the damage in there is not insignificant either... it appears they've gnawed their way in through a wooden wall (boarded up door, essentially) worked up and through the ceiling, then gnawed through the plasterboard to get into the room itself. Frustratingly, I've no clue what it is that they've shredded overnight last night, but it looks papery as though it is more plasterboard. I suppose I won't find out until I haul the entire room apart (a huge task in itself) and I am not inclined to do that until such times as the poison stops being taken, signifying I've won the battle.

 

There has also been a spate of gas main replacements and water works right round our area, so that may be a factor here too. I've got a load of wire wool, so will stuff the entry holes with that before filling over eventually with filler.

 

Well, the rate of stuff being taken in the outhouse has slowed, but some was taken last night; the tray in the greenhouse has been emptied, so I will fill that back up shortly. I'll keep going as long as it takes