B hive is a National brood box with a gabled roof. It is unoccupied. Two colonies have failed in this hive, which may be significant.
It was occupied by a swarm collected from Headington on 4th June 2016. The colony was always small and may have absconded or failed following heavy robbing. It had been moved from central Oxford on 13th May 2017.
Before that it was occupied when I received it in Jan 2012 but the colony failed. I think that robbing by bees from A Hive, and mishandling by me contributed to its failure. It was unoccupied for 2 seasons.