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Hii Graham, I do not know the maker of this telescope. It does have similarities to Broadhurst Clarkson of England and Watson also of England. These two makers were nearly identical in some models and I believe Broadhurst Clarkson supplied Watsons with tubes and focusers etc for some models. The peculiarity of your telescope is the mechanics of the collimation with those pairs of "L" brackets and the threaded adjusters that alter the separation of the brackets and thus the cell tilt.
I have a 1923 Watsons Astronomical catalogue and nothing resembles that method of cell collimation. I have two different 3" Broadhurst Clarkson telescopes and they also resemble Watsons. They are engraved with Broadhurst Clarkson and an address on the focuser.
Maybe try enquiring on the Yahoo group Antique Telescope Society "https://groups.yahoo.com/neo/groups/ATS_Forum/info
It sure looks to be a magnificent telescope. All the best Mark
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