Workers will enjoy longer holidays under a future Labour government as part of a 10-year plan to see the length of the average full-time working week drop by five hours, the shadow chancellor, John McDonnell, has announced. Speaking at the party’s conference in Brighton, McDonnell said he wanted to see a marked cut in the average working week from 37 to 32 hours within a decade, with no loss of pay. The shadow chancellor said Labour would adopt a two-pronged…