My pleasure.
The M14 MGMC with twin .50 cal Maxson AA turret was primarily manufactured for Lend-Lease use, the United Kingdom being the main recipient. But the British army did not have a use for the AA half tracks and removed the Maxon turrets. Converted M14s were used a GS load carriers, personnel carriers, Command Vehicles, Armoured Observation Posts, Ambulances, etc. by various Commonwealth armies, including the British, Canadian and most likely others like the French and Polish.
The M14 rear hull plate did not have a door but the half-tracks often had a door added as part of the conversion process.
AFAIK no M14's are preserved in any of the British conversions, in my opinion it would make a great restoration subject with lots of variants to choose from.