40 mm Bofors AA guns made in GB and US

[David_Hayward (RIP)]

Royal Army Ordnance Corps Depot, Bicester [pronounced as in BISTER] is or was until recently [as it was closing at least in part] in Oxfordshire, and is/was near RAF Bicester, an airfield where there is a gliding club now. There was apparently a War Department railway and was a major depot and large employer.