Never say never but the more you research this subject the more you get confused. I’m pleased to say I’ve received a number of messages with good solid information that helps us piece together these changes. The problem is we seem to have the sequence correct but dating accurately when they were made seems an impossible task. Even dating car built dates accurately is questionable and I will give you an example below:-
Two Riley Kestrel 1100 cars registered a day apart in October 1966.
First car built 1 December 1965 - with chassis number R-ASI-4193A first registered on 6 October 1966
The second car built 22 February 1966 – with chassis number R-ASI-9147A first registered 5 October 1966.
With a difference of 4,954 between chassis numbers were BMC building 450 Riley Kestrels per week at Longbridge or Cowley? Even dating when production changed to Cowley is blurred.
Graham Robson in his excellent book The Cars of BMC claims that 21,529 Riley Kestrels were built from 1965 to 1967 which we have no reason to doubt. My query is if BMC built 4,954 Riley Kestrels over an 11 week period things must have slowed down after this run. The other point is that these two cars from build date to registration date took some time from what we see with this example.
It goes without saying we will share all we have on this subject with both ado16 info and this forum.