My later father-in-law served with the RAF Regiment in Burma in WW2 and drove the Armoured Carrier Wheeled (Indian Pattern) which from his description had a turret, so that would I think have been a Mk III.
Has anyone got a picture of a Mk III as I can only find this on the web; on this link its in ACV-IP Gallery
http://www.tanks-encyclopedia.com/ww2/India/ACV-IP.php
Any photos of this and earlier versions in use by the RAF Regiment in India / Burma in WW2 gratefully received.