Travelling in India after graduating, Ben Meldrum, 40, learnt how to make traditional metal puzzles from a street seller in Calcutta — then began selling them from a stall in Covent Garden. He established Professor Puzzle in 2002. The London company designs its metal and wood toys and puzzles, and sells through stockists in France, Germany and the US, including the bookseller Barnes & Noble. Exports rose to £3.5m last year.
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