Boomtown

Rat. Definitely. Thought I'd noticed an unfamiliar face around the garden, so did some id photography. Now, I'm not freaked by rats, maybe the result of much childhood rat positivity - Tales of the river bank ; Wind in the Willows; Fingerbobs (tho' looking at the size of the ears he was most likely a mouse..) but I know they are deemed vermin and are therefore officially A BAD THING to have about the place.
Next internet search, humane rat traps...