Large Folks and just the curious:
Here is a 24 1/2 inch Carlton frame on eBay offered by an internet-BOB fellow that has canti bosses and an extension for fitting a caliper brake on the front fork.
Good thing I'm too short for it because it'd be a great base for the Holdsworth tricycle conversion kit that is gathering dust... Back to Plan A for me - use a tatty old Holdsworth Freddie Grubb.
This one had to be a bit of a one-off. Hope it finds a good home.
Charlie Young
Honey Brook, PA