Yeah, I've been to the Athelney spot a few times - now little more than a bump in the ground. At the time of Alfred The Great (who holed up there prior to Battle of Eddington, near Westbury) it would have been reeds and marshland and Athelney itself a small fortified island, very difficult to find and access without local knowledge. A good place therefore for hiding out from Danes (the local history has it that the burning of the cakes legend may well have been based on fact and probably originated from this area). There was also an exquisite jewelled pointer found at Athelney - one of the finest Saxon objects ever found - now in the Ashmolean Museum I believe.
The only thing I remember for the tourists at Athelney is some ruins of the Abbey and a few historical exhibits on show (medieval tiles and the like).
Anyway, back to the weather. Looks nice out there.