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,
S postcode area S postcode area The S postcode area, also known as the Sheffield postcode area, is a group of postcode districts in and around eight settlements with post town status: Barnsley, Chesterfield, Dronfield, Hope Valley, Mexborough, Rotherham, Sheffield and Worksop in England. Of these Dronfield and Mexborough have one postal district. Currently the area has 49 non-sequentially numbered postal districts, three of which are 'non-geographical' being for bulk users in Sheffield and Rotherham. There was originally an "S sector" of the London postal district, which was abolished in 1868. Similarly, there were also S-prefixed postal districts in the compass-based system used