English: Dollis Hill, former Post Office Research Station. This is now Chartwell Court flats. It was built in 1933 as the Post Office Research Station, which included telecommunications research. The history section of the BT website http://www.btplc.com tells us that: "What is generally regarded as the world's first programmable electronic computer (Colossus) was designed and constructed by a Post Office Research Branch team headed by T H Flowers (1905-1998). It was constructed at Dollis Hill, and transported to Bletchley Park near Milton Keynes, where it was demonstrated on 8 December. Bletchley Park was the centre of British wartime code breaking operations."