Look, though: a moth has come to visit us indoors instead. Penny is the specialist at spotting these, maybe through some genetic superiority among women going back to ancient battles with the very few 'clothes moths' which damage favourite sweaters. She spotted it after the Ten o'Clock News, flitting around our sitting room.
I got the first, rather poor picture then and had a sleepy and fruitless look through my Moth Bible; but shortly afterwards the insect ventured upstairs into our bedroom. I found a nice box and gave it a bedroom of its own overnight, before photographing it outside just now.
I shall seek more advice and meanwhile hope that things warm - and dry - up. (See Dave's helpful comment; for once, I was right).