Alvis, Ltd. Standard 885 b.h.p. engine as fitted to the first Handley Page Heralds. ... D. Napier and Son, Ltd. Helicopter rotor-tip boost rocket as fitted experimentally to the Saro Skeeter. ... First ramjet to go into, service in the U.K. Triple Scorpion N. Sc.T.L a D. Napier and Son, Ltd. Shown for the first time; three- barrel version of ... A. V. Roe and Co., Ltd. A test vehicle on the companya#39;s stand with Perspex panels to reveal internal arrangement. ... Demon- strand in g.w. park by R.A.F. team.