This is a first for me also but like I was saying back in the early days of the sewing machine there were over 150 different manufacturers of sewing machine in America alone. And the chance of it being a badged machine (meaning someone elses machine, their name) is really strong. It could have been made for a department store or a sewing company in GB.
I can not wait to see the photos of it when you get it home and it does sound like a treadle if it had a cast base to it.
Billy