If I'm not careful, we'll be round to the next Tolpuddle festival before I've posted all the photos I took of the banners in 2016. (Not that I photographed them all; it's a massive event!)
General and Municipal Workers Union (Wiltshire and Swindon).The 'B' is for 'Boiler Makers' but this is for historical reasons - it's really for a much wider group than that.
Here's a link to Wikipedia information about the White Horse carved into the hillside at Westbury in Wiltshire.
About the Tolpuddle Festival on Message in a Milk Bottle
Photos from the Tolpuddle Festival 2016 on Message in a Milk Bottle