Every time a paratrooper in Britain’s airborne regiments goes to the stores to pick up his parachute as a prelude to going into action, it’s handed over with the same old corny gallows-humour banter — ‘Bring it back if it doesn’t work and we’ll exchange it.’ You could apply the same logic to the Parachute Regiment’s most famous World War II mission: the abortive attempt to capture from the Germans the bridge over the Rhine at the town of Arnhem in the north-east of the Netherlands in the autumn of 1944. It spectacularly did not work — and, once it...