I have mice. I had thought it might be creatures living in my wood store on the roof, or hungry nocturnal visitors that just came to investigate my planters but no, it/they are in the roof space, chewing on polystyrene :-(
They seem to have come in via the mushroom vents.
I saw they'd been in one high-up cupboard that's against the ceiling. Unfortunately there was a gap in the wood and they scoffed sunflower seeds, pumpkin seeds and linseed - trust me to live off mouse food! But they don't appear to have got into the main living-space, thank goodness. Anyway, I've sealed up that gap and stored everything edible in mouse-proof containers but am loathe to block off their escape route before they've left the boat.
So, I'm looking at humane mouse-traps on the internet at the moment, with a view to releasing them onto Walthamstow marshes. Not that humane as I've seen a kestrel nearby, intent on its prey.
There seem to be high-tech ones....
and low-tech ones..
And being a cheapskate, I may have a go at how to Build your own mousetrap
One difficulty will be how to place a trap as I can't really get in that space between the ceiling and boat roof, though I guess I could suspend bottle traps below the mushroom vents if I remove the grills. It's a big faff, but I'd better get on with it because they keep me awake at night!