Summer time, and the windows and doors are open.  The first time I saw the vole zoom across the floor and take refuge under the sofa, I was a little surprised, but assumed it had been imported by a cat.  Then I thought that it has been a long time since any of our geriatric cats bestirred themselves to hunt, so this seemed odd.

This afternoon, I surprised the vole half-way up our Ikea shelves, tucking in enthusiastically to a small bar of chocolate it had found there that I had put safely out of reach of the dogs.

I now believe it to be not a sad Victim Vole, carried in by predators, but  a bold Raiding Vole, nipping in through the french doors in the hope of finding loot.

Definitely a vole.  Not a rat, not a mouse. Vole: little round face, short tail.