I don't know the Whirle, but Windsor made assorted models of banjo over the years. They are likely to have made tenor, 5-string, uke, Mandolin versions within a design and "name". Some of the different models will have been similar to other "names" of model, possibly built in a slightly different period, or offering modified features.
They also made banjos for other "brand names". I own a Barnes & Mullins 5-string. Although they sold banjos with their name on, the firm didn't actually make the models sold, they contracted the manufacture to other companies, one of which was Windsor.
Over the years I have seen a lot of Windsor banjos, and in general they were well-made and sound instruments.
Quack!
Geoff.
p.s. Davetnova - did you lose a bit of pub-prop at the Globe?