Here’s a bit of filler from the October 1, 1928 Toronto Daily Star:
I love this article – it has both too much detail and too little. We don’t know the name of the ice cream manufacturer, or which British towns the fleet operates in, but we do know that it contains 1100 tricycles.
A search for “ice cream tricycle 1928” uncovered this site, which suggests that the manufacturer might have been Wall’s. The photographs are fascinating. (Wall’s ice cream still exists, but the brand has been swallowed up by Unilever.)