Calling all Boulton-Paul specialists

Can someone confirm whether the attached graphical representation is that of a Boulton-Paul inspector’s stamp?

I’d also like to know if there is any evidence of Boulton-Paul allocating any constructor’s numbers to the Fairey Barracudas and Blackburn Rocs they produced.

Grateful for any leads (as long as it’s not a suggestion to contact the FAAM!! ;))

Lee