There is a report somewhere - I think it was at Warminster from the old sniper school prior to its move to Bisley that gave the quantity of scopes that had been produced for the Bren that could/would be available if the No4T trials (such as they were......) were successful. I think it was about 6,000+ or so telescope. On a numerical basis that would put these first 6000 or so as VERY likely contenders for the trials T's and subsequent initial batches. But as you know, there's something very non scientific/random about speculation, however well thought out.
Maybe I sent DRP the actual number...... It was from this report that I learned that KL - as in Mk1 and 2 telescopes - was nothing to do with A. Kershaw in Leeds but Kodak Ltd in Hemel Hempstead, who the report said were stepping up production. Or whatever it was they were improving..........