Just received this picture, from Gail Jeffcoate, of a Pale Tussock in February!  Has to be a record.

Gail said: "It was on a door at my cousin's house in Taunton (where I was staying to attend BC Regional Conservation meeting). I know this is a common moth but thought you might like a record of it in February! I suppose it might have pupated in their house/garage somewhere, hence the early emergence."

The 'normal' flight period is shown below: