I came across this film that someone made with a nice music track to go with it. It looks to be mainly USA signs but I spotted a couple in there from the Kentish Town/Highgate area, including the one for KM Larn and also the one advertising a place that used to offer Beanfeats. From Wikipedia, a Beanfeast “is primarily an annual dinner given by an employer to his workpeople, and by extension, colloquially, describes any jollification”. Sounds fun to me! Full description here.
I got in touch with JD Productions who say that this video is a collection of stills gathered from everywhere on the internet over the past couple of years. “Memories on TV” editing software was used and the music is Helen Forrest with the Benny Goodman Orchestra.