Medieval artwork safely delivered to British Museum before display from September in carefully controlled conditions Bayeux tapestry crosses Channel in dead of night for historic exhibition The Bayeux tapestry has survived myriad perils, from cathedral fires to its potential destruction for use as wagon covers. Now, with the embroidery about to be displayed in a blockbuster London exhibition, experts must contend with a host of more insidious dangers. The arrival of the tapestry at the British