A good find and good research!
LHD indicating overseas destinations brings me to the sales literature stating the eight wheelers
as L1786 with choice of Gardner 6 LW and 6 LX or ■■■■■■■ NH220 or RR C6NF. The year of the
brochure is 1962 and it also appears Atkinson then already offered the ■■■■■■■ NT335 optionally.