Yep! I saw a mouse this morning - in bright sunshine, at about 9.30am, climbing up and down the achillea cerise and Lychnis Chalcedonica! (that sounds impressive. like I know the latin names, but I had to look those up in my very own 'Flower Bed 3' Idiot's Guide to Planting; sadly, I don't even remember the generic names!
And I have some (not very good) photos to prove it - see below