Sinclair C5 "a delightful toy" "The Daily Telegraph" described it as "a cleverly-designed 'fun' machine that can hardly be regarded as serious, everyday all-weather transport", while "The Engineer" viewed it as "a smashing big boy's toy, tough enough to take teenage thrashing and possibly a serious vehicle for fit adults to nip out in for the Sunday papers". On the plus side, the C5's handling characteristics were praised by reviewers. "The Guardian" called it "very easy to master once you have become familiar with the under-thigh handlebar steering and the semi-recumbent driving position with feet on bicycle-type pedals." The "Daily Mirror" described
Sinclair Scientific fraction of the cost of competing calculators. In 1972, Hewlett-Packard launched the HP-35, the world's first handheld scientific calculator. Despite market research suggesting that it was too expensive for there to be any real demand, production went ahead. It cost (about ), but despite the price, over 300,000 were sold in the three and a half years for which it was produced. From 1971 Texas Instruments had been making available the building block for a simple calculator on a single chip and the TMS0803 chipset appeared in a number of Sinclair calculators. Clive Sinclair wanted to design a calculator to