Raspberry Pi founder Eben Upton has sold £1.8 million worth of shares in the Cambridge-based microcomputer company, reducing his stake just over a year after its high-profile stock market debut. The sale came as a 365-day lock-up period for directors and senior executives expired this week. Upton, 47, who launched Raspberry Pi in 2008, was joined by the company’s chief financial officer, Richard Boult, who offloaded £455,000 worth of shares. The transactions were disclosed in...