Please see
Secret diary of a civil servant: This government is already leaking like a sieve | Secret diary of a civil servant | Politics | The Observer
The officer with Liam Fox seems to be an Air Commodore, if I read the shoulder boards correctly.
A Google search for Air Chief Marshal Angus Houston only produces images of the chief of defence staff in the Royal Australian Air Force, a clean-shaven pilot.
Does anybody agree the Grauniad team has the wrong name ? If so, can anybody supply the correct name ?
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The newspaper accepted the mistake by email on 5 October. New readers will find the photograph correctly naming ACM Simon Bryant. I had not realised how looooong those shoulder boards are ! RLSB