sentences:  The then Trade Secretary Peter Shore conducted a review of the Government's aviation policy and in 1976 announced a new "spheres of influence" policy that ended dual designation for British airlines on all long-haul routes.It was no longer believed that competition was increasing the UK market share of the traffic.As a result, BA and BCal were no longer permitted to run competing scheduled services on long-haul routes, and BCal had to withdraw from the East African routes inherited from BUA as well as from the London—New York and London—Los Angeles routes.