For bombers the additional requirement was a placename, hence the Boulton Paul Bourges; and its contemporaries - the Airco Amiens and Vickers Vimy (Bourges, Amiens and Vimy all being in France).
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The prototype R.B.1, with the designation Iris I, and with the serial number N185, made its maiden flight from Blackburn's factory at Brough on 19 June 1926, being delivered to the Marine Aircraft Experimental Establishment at Felixstowe the next day, being fully tested during July and August.