How author researched his plots and letters from Alec Guinness feature in Oxford exhibition How author researched his plots and letters from Alec Guinness feature in Oxford exhibition Lamplighters, pavement artists, babysitters – they have taken on whole new meanings thanks to John le Carré . As his fans will know, they are part of tradecraft practised by the spies he wrote about so evocatively. Now, almost five years after his death, an exhibition, with the title Tradecraft, reveals the