Time Team S10-E08 Athelney,.Somerset

To mark the 100th episode, Tony Robinson and the Time Team return to a site they investigated in the very first series.
Athelney is one of England's most important historic sites, where King Alfred established his stronghold and organised the campaign to wrest England from the Vikings. But it has never been excavated - ten years ago, the team weren't even allowed to dig!
But this time the trenches go in and, amid the reminiscences, the famous fortified abbey yields its secrets, among them a remarkable revelation about its origins.