HWDC står får The Heathrow World Distribution Centre
The Heathrow World Distribution Centre (HWDC) is the international hub of the Royal Mail group in the United Kingdom. It is situated in Langley, near Slough, UK. A large portion of mail entering and leaving the United Kingdom passes through this office under tight aviation security standards, following the closure of various other International Mail handling facilities, such as Dover Office of Exchange. Not all of HWDC's mail arrives by air, as road vehicles that formerly arrived in the UK by ferry at Dover, or container ship at Southampton now extend their trip to HWDC by road, instead of entering the Royal Mail network at the Offices of Exchange situated nearest the ports. Outbound mail usually leaves the country by aircraft from Heathrow airport, even international mail not marked airmail.