I was called by Mary, a member of my group. She had caught a swarm from her top-bar hive in Headington. She kindly offered me the swarm, knowing how much I value untreated colonies.
The swarm is from a colony which Mary has kept, untreated, for about 2 years in a Top Bar Hive. Before that they came from a feral swarm somewhere near Steeple Aston in Oxfordshire.
I took the swarm down to central Oxford in the early morning and walked them in. They went in very willingly. The swarm was a reasonable size. I didn't see the Queen going in.