ABC
Allen (W.H)
Alvis
Anzani /British Anzani
Armstrong Siddeley
Beardmore
Beatty (Inc School)
Berwick
Blackburn* (Cirrus)
Blackburne  (Burney)
Bristol
Bristol Siddeley
Carden
Cirrus  + Cirrus Hermes
Clerget (Gwynnes)
Curtiss-Wright
Dansette-Gillet
Davies (James)
De Havilland
Douglas (Engines)
Empress
ENV
Gnome
Green Engines
Isaacson
Lascelles
Monk Engineering
Napier
New Engine
Pobjoy
Herbert Porter
Rolls-Royce
Rover
Salmson  (British)
Sturtevant
Sunbeam
Thames
Thomas
Viale
Wolseley
I chose this 1914 image because it's a striking design in it's own right. Although not apparent it's actually a portion of an advert. The Pobjoy Niagara was a high revving aero engine and geared to reduce propeller speed.
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List Of British Aero Engine Manufacturers From 1909 - 1990