About 1800 walked out of my flat for 30seconds and somehow had timed it perfectly. As soon as I opened the door I could feel my semi rising at the sound of a merlin. Flying over Norwich at quite low altitude was a Spitfire. Possibly mk1 (v.rounded wingtips, no visible "cannon"). I'm pretty good at IDing spits, but it was only visible for a short time so couldn't be sure on a mk1. Beautiful and absolutely made my day as very rare around here. Anyone shed any light on what spitfire it was and what it was doing up here?