That is the one
The Short R.24/31 (Knuckleduster).
The story is that the wing/nacelle joint was known as the 'knuckle' and the fact the aircraft never had any official name the aircraft was nicknamed the "Knuckleduster".
Only three prototypes were built, the role for which this aircraft was built was eventually filled by both the Sar London and Supermarine Stranraer biplanes.
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