All good things eventually come to an end, and I am currently working on the Genealogy in Hertfordshire web site to get it into a form where it can safely and usefully be archived. There is a long backlog of Hertfordshire postcards waiting to be loaded onto the site - and there is an embargo on purchasing more (although I am always happy to receive digital images which augment existing pages).
Even if I am not buying I occasionally see interesting cards on ebay - and one has just caught my eye. It shows a procession, photographed by Albert Arthur Durrah (1890-1973) of Rickmansworth. A group of men are carrying the above banner. Can anyone suggest the full name of the trades union (which is unfortunately obscured)?