We have always seen the odd solo mouse, at the back and front of the house, over the years. Once we thought we heard one inside a wall. None of this has worried me. It is perfectly natural that there will be mice about, (just as there are owls, badgers, foxes, hawks, deer, frogs and toads. Sadly no hedgehogs anymore). I have felt that we have an unwritten, and only spoken by me, agreement that they stay outside, and I have no problem with them sharing a bit of bird food in exchange! This year though, for the first time after decades here, we are seeing more. After dark at least 6 of the little blighters were running about outside. I realise our farming, brewery and stables friends sometimes have to deal with hundreds, but are we likely to be developing a mouse problem? If so, what to do, if anything, and will they inevitably end up over the threshold?