When you switch on your TV or radio, chances are at least some of the technology that brings you the picture and sound started life in a sprawling gothic mansion house in deepest Surrey.
Kingswood Warren, home to the BBC's team of broadcast technologists since the 1940s, is where standards in HDTV, Nicam digital stereo and teletext were all developed.
At the end of February, the tech team are moving out and heading to new premises in London. With the packing under way, the BBC's Zoe Kleinman went for a last look around the historic building.
