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The Bunker formed part of the revolutionary air defence system devised by Dowding.
This comprised an integrated air defence system which included
- Radar (whose potential Dowding was among the first to appreciate).
- Human observers (including the Royal Observer Corps), who filled crucial gaps in what radar was capable of detecting at the time (the early radar systems, for example, did not provide good information on the altitude of incoming German aircraft),
- Radio control of aircraft.
The whole network was tied together, in many cases, by dedicated phone links buried sufficiently deeply to provide protection against bombing. The network had its apex (and Dowding his own headquarters) at RAF Bentley Priory, a converted country house on the outskirts of London.
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