From Stamps of the World
London Western District office first opened in Old Cavendish Street it was the first office to be supplied with postal cancellations along with the South Eastern Office.
London (W) Office at Old Cavendish Street, Soho 
See Also - Notting Hill W (GB)
Regent's Street Fouberts Place W 
Designated W.22 for the West London Office. It was situated at #4 Fouberts Place. Telegraph Office code RCP
The Langham, London is one of the largest and best known traditional style grand hotels in London. It is in the district of Marylebone on Langham Place.
The Langham was designed by John Giles and built between 1863 and 1865 at a cost of £300,000. The Langham was hard hit by the Great Depression and the owners attempted to sell the site to the BBC, but Broadcasting House was built across Portland Place instead. During World War II, the hotel was used in part by the Army until it was damaged by bombs and forced to close. After the war, it was occupied by the BBC as ancillary accommodation to Broadcasting House, and the corporation purchased it outright in 1965.
The hotel featured in the James Bond film GoldenEye. The hotel has a five star classification and is now the flagship of Hong Kong-based Langham Hotels International.