David Nicholls’s romantic saga is heading to stage, in the very city where its characters first felt the sparks fly. But how to cram 20 years of romance into two tune-filled hours? By focusing on the little moments, say its creatorsPlaywright David Greig and director Max Webster are not afraid of a theatrical challenge. The last show they worked on together – The Lorax at London’s Old Vic in 2015 – transformed a complicated Dr Seuss story about capitalism, global heating and a grumpy forest guardian into a bright and breezy family show. Greig has tackled mammoth musicals (Charlie and the Chocolate Factory) and mountainside thrillers (Touching the Void), while Webster’s biggest hit, The Life of Pi, conjured up floating tigers and raging storms with theatrical flair and swagger.Now the two are collaborating on a staged musical of David Nicholls’s much-loved – and much-adapted – novel One Day, first published in 2009. That might sound like a relatively straightforward theatrical challenge...