Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 140,143 pages of information and 227,382 images on early companies, their products and the people who designed and built them.
Note: This is a sub-section of Alvis.
1937 Aero engine manufacturers. "Alcides" and "Alcides Major" Aero Engines. "Pelides" and "Pelides Major" Aero Engines. 
1939 The first "Leonides" aero engine flew in a Bristol Bulldog
1957 A high proportion of aircraft flown at the Farnborough display were powered by Alvis engines including those of Bristol Aeroplane Co, Hunting Percival Aircraft Co, Scottish Aviation, Westland Aircraft Co