Typical swarm locations
Collectors in Brigg most often attend swarms on the older properties around the Market Place and Wrawby Street — lime mortar and brick chimneys being a persistent source of cavity colonies — in the river-bank willows and elders along the Ancholme, in the garden trees of the residential streets to the south, and on the hawthorn hedgerows of the farm lanes towards Wrawby and Kettleby.