This is a copied post from another thread that may be of use to some.
The following information comes from the Grenville Motors "Allocations Books"
3 seats: R861132 (June 1949) is noted as 3 seats, so everything before that had only the two outer seats. R861306 is also listed as F/Hood and 3 seats, but I'm unsure if the F/Hood is the truck cab hood. (3 seats is also a notation on later vehicles)
PTO: R861164 (June 1949) the first mention of a PTO
Bonnet Spare wheel: R8666133 (December 1949) is the first mention of spare wheel bracket on bonnet, which means that vehicles before this one probably all had the spare behind the transom.
Centre PTO: R06200076 (April 1950) mentions centre PTO which makes sense for a Welder and indicates that all the "PTO" before probably had the output on the gearbox and on the rear cross member)
Capstan winch: R06108669 (June 1950) the first mention of "winch", so likely all the 1948s and 1949s we now see with winches were all retrofits. (Remember the mounting plate for the Aeroparts capstans wont fit on the early chassis without modification.)
Metal roof: the first mention of a "Metal Top" in the Grenville Motors books is January 1951, prior to that they were listed as STD (soft top) or PTO or Winch (Capstan) sometimes "PTO/winch" meaning both
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