Eben Upton was perhaps the last person at Raspberry Pi to realise that the company had become swept up in a meme stock trading frenzy. The chief executive of the British microcomputer maker was on a half-term skiing holiday in California on Tuesday as shares in the company jumped by more than 40pc, driven by predictions that it would ride the artificial intelligence boom. From his mountainside hotel room, Upton says: “I was asleep for the first six or seven hours, so it was funny to wake up to so many W ...