Confidence: It's likely to be this, but I can't be certain.
Notes: Here we go again! I can't find any photos of Barred Carpet with feathery antennae which your moth seems to have. Twin-spot and Red Twin-spot both have feathered antennae but this looks more like a worn RT-sC to me. Luckily, I still have a piece of humble pie in the fridge.