 However, this equated to a British fiscal horsepower of  (compared to the of the larger engine) and attracted a punitive annual car tax levy of £1 per fiscal hp in the UK.It therefore was expensive to own and too heavy and uneconomical to achieve volume sales, and so unable to compete in the newly developing mass market, while also too crude to compete as a luxury product.European manufactured Model As failed to achieve the sales success in Europe that would greet their smaller successor in Britain and Germany.