Sir Arthur Wilfred "Bill" Bonsall KCMG, CBE (25 June 1917 – 26 November 2014)[1] was director of the British signals intelligence agency, GCHQ—a post he held from 1973 to 1978.
In later retirement he was concerned to preserve a more accurate record of the non-Enigma side of Bletchley Park, especially the work of the German Air Section.
The first outcome was a talk given to a Cheltenham Probus club, later developed into a privately printed family memoir entitled 'Another Bit of Bletchley'.
21 in the same series, entitled 'An Uphill Struggle',[8] dealing with the internal battle to overcome Air Ministry failure to understand the value to RAF Commands of tactically derived signals intelligence.
He collaborated closely with Wg Cdr John Stubbington in the latter's 2012 account of BMP reports by the German Air Section.