The Windsors came in whole range, from one sold through the Co-op to some very fine models indeed. I believe the President, and possibly the Emperor were at the top end. I had a "Popular" and it served me well for a lot of years - picked it up in a junk shop in Birmingham in the sixties.
If anyone was watching Larkrise the other night, they would have seen a Whirle tenor accompanied by a melodeon...both probably well out of period.