by thomas » Sun Mar 29, 2020 1:18 am
As Bob hints, I expect too these designations fell by the wayside in August 1967, known confusingly as '68 model year cars and vans, and were I'd hazard only for internal and for parts identification purposes. There no longer being of course any HA Saloon cars by then, HAV/HAE were both replaced by chassis/vin numbers commencing with 92, the HB and earlier HCs using 93. HA Vans being at different times available 6, 8 and 10 cwt form.
According to other info on-site, conflicting with that quoted above, HAE was Standard/Base Spec. and HAV was Deluxe, though it's suspiciously like the later use on the HB of E for Ellesmere Port, and V for Luton (estates and GTs and perhaps other OHC models). HA Saloons were built in both places, vans probably were too and additionally at Dunstable, which might be where the D comes from, but apparently in the new post August '67 vin system the letter 'T' was used to denote Dunstable. Someone Who Knows might be along sometime who can make sense of it.