E postcode area continue to be commonly classed as one 'district'. The E postcode area contains two non-geographic postcode districts for high-volume business users, E77 and E98. The Eastern District Office is on Whitechapel Road and was the eastern terminus for the former London Post Office Railway, which has been mothballed since 2003. The railway ran to the Paddington Head District Sorting Office. The E20 postcode has been used fictionally as the postcode on the television soap-opera series "EastEnders" since 1985. However, it became a real postcode in 2011, when it was created from within the E15 postcode for the new Olympic Park,
EastEnders storylines including HIV, Alzheimer's disease and murder. After a successful revamp of the soap, Ferguson decided to leave "EastEnders" in July 1991. Furguson was succeeded by both Leonard Lewis and Helen Greaves who initially shared the role as Executive Producer for "EastEnders". Lewis and Greaves formulated a new regime for "EastEnders", giving the writers of the serial more authority in storyline progression, with the script department providing "guidance rather than prescriptive episode storylines". By the end of 1992, Greaves left and Lewis became executive and series producer. He left "EastEnders" in 1994 after the BBC controllers demanded an extra episode