National Express has re-introduced double-decker coaches last month to the fleet, to allow it to cope with growing number of customers.The first double-deck coaches to be used by company for some years will have 79 seats - making space for 27 more people than the current standard vehicles - while retaining the current levels of comfort. The double-deck coaches boast luxury leather seats with tables, power sockets, free Wi-Fi and a toilet.Five of the batch will be operated by National Express’ on its popular line between London Victoria and London's Luton Airport. The sixt...