Ok I will stick with A2733.
But no the B.E.10 had no connection with the B.E.9.
It was designed as a replacement for the B.E.2c but was not based on a previous B.E. design but on something else entirely.
(which is all I shall say here or there will be no point in writing the article!)
Incidentally we have to remember that when jack Bruce first wrote his magnum opus many TNA (or PRO as it was then) files were still closed under the fifty year rule.