The play: Sunrise is 6:29 AM — you're standing in Britain's largest cathedral close as the light hits the spire,
then out to the water meadows for the Constable view while the mist is still on the grass and only dog-walkers are about.
Cathedral interior doesn't open until 8:00 — this is the outside hour, and the outside is the best part at this time of day.
One-way loop, no backtracking, dead flat.