I was called today to collect a late swarm from Barton. The woman who called me says that it is the 5th swarm this season to leave a nearby feral colony.
The feral colony is living in an air brick in a house about 30m from the apple tree where the swarm was clustered. The swarm emerged on Friday. Today is Tuesday. She'd expected them to disperse but there they were.
Collection was simple. Shake them from a branch at head height into a nucleus box. Leave for 5-10 minutes. Thank everyone and remove.