"There's a mouse in the hallway" says Sprog No. 2.
"Right" says I, engrossed in downloading coordinates for an afternoon's geocaching.
"No, really!" says Sprog No.2.
"We haven't got mice" says I in a 'Tsk, kids!' kind of way.
"Come and LOOK!" says Sprog No.2.
So I went and looked and this is what we found:

This little chap was actually a tiny rat who had wandered in through the garden door, obviously having taken a wrong turn on the way to rat church. In an extended and, at times, highly dangerous programme, Little Rat was reintroduced to a habitat more suited to the needs of the four paw and whiskers brigade. If he ran all the way, we reckon that he would have still caught the sermon and the last hymn.