His efforts to bring in senior executives from competitors were only partially successful, and persistent infighting (such as the refusal of Triumph to accept the Rover V8 engine for the Stag convertible, and the discrimination against MG in allocating investment funding in favour of Triumph) whilst the inherent unprofitability of BMC sapped the competitive position of the new business. Meanwhile, Leyland Motor Corporation's new engine policy of the late 1960s had failed, with the AEC V8 and the Rover Gas Turbine being dropped by 1973 and the Leyland 500 series fixed head engine confined to lower-powered, mainly bus applications before being dropped in 1979; the thirst of the gas turbine and the unreliability of the V8 (which had been rushed to market as an under-developed unit) and the 500-series cost sales and enabled Scania and Volvo to enter the UK market.