Simmonds Aerocessories, Great West Road, Brentford – Wallis, Gilbert & Partners – 1937 They used to manufacture parts and patent devices for military aircraft until 1947.  In 1955 the building was taken over as headquarters for Beecham Group Ltd, which now as GlaxoSmithKline has its HQ across the road in new purpose-built complex. The Simmonds […]