Flooding as a result of heavy overnight rain has brought major disruption to trains running through Bishop’s Stortford. Train operator Greater Anglia says that owing to signalling problems in a tunnel outside Stansted Airport caused by flooding, Stansted Express services between London Liverpool Street and the airport are “severely disrupted”. The railway was also flooded at Audley End, blocking lines, but after Network Rail staff had resolved the problem, GA reported at 11.55 that all lines were now open, although disruption was expected until 1pm. Trains are having to run at reduced speed on…