A slight correction to some of the detail of some posts above, if I may.
After lying semi-derelict for some time, BH was bought by International Aeradio Ltd (IAL) in 1978 and the IAL College of ATS (previously located at Oxford Airport in an unprepossessing single-storey block) started to move there and start operation at the end of that year along with other training initiatives. The accommodation and recreation block was added at that time.
IAL was a subsidiary of British Airways, having originally been owned by BOAC to provide ground services at various staging posts across the world and, in turn, Aerad was part of IAL. Prior to that time, IAL provided. or had provided, ATS at many locations world-wide - the West Indies, Libya, West Africa, East Africa, the Far East and notably the Middle East (Bahrein, Abu Dhabi, Dubai, Sharjah etc) - and also at a number of small units in the UK, then just around that time (70s and 80s) adding contracts at Liverpool, Bournemouth and Southend Airports and the Brent Field HFIS in the North Sea.
BA later sold IAL down the river to BT who conducted an asset-stripping exercise and then sold the company on to Serco, whence it became Serco-IAL. As I understand it, Bailbrook College continued successfully until Serco overstretched themselves in their bid to get their sticky paws on NATS at the time of PPP and they were obliged to sell the family silver to make up their losses.
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