It is my understanding the number of 125 to 150 shop builds per year talked about by Kigariff is used by him in reference to only Reg Collard's Shop builds in early 60's. I think I have only seen this number in a letter from Kilgariff in assessment of a c.1963 Italia built by Collard. Kilgariff quotes correspondence from Collard. Does someone else have other sources? True Adventures of the Retro Grupetto: Holdsworth Italia

In history section of website, Kilgariff states Collard joined Roy Thame in 1958 to build specials as requested by factory, which was trying to stick to set models and getting away from custom builds. When looking at shop numbers with 2D date prefix collected from 1965 onward there does appear to be a gradual ramping up of numbers from 1966 on. In the above letter Kilgariff also talks of other builders in mid to later 60's such as Charlie Roberts, Alec Bird and Tommy Quick and no doubt others who were mainly building stock frames. Around 1970 Quick took over as the main shop builder when Collard retired. Kilgariff says these builders were also building frames for WF Holdsworth at other sites, so not all frames were built at the smallish Putney shop.

So, perhaps there was indeed a gradual ramping up of the WF Holdsworth Shop numbers over the years of the bike boom with the addition of various builders. Dave Scrimshaw lists an Italia 74826 which, even with a "ramping up", makes 826 seem a very high total builds for 1974. Unfortunately we are getting to a time where people as Kilgariff and those with first hand experience re numbers are disappearing although we can hope that someone will chime in. Otherwise, hopefully more numbers will clarify.

I agree Bob Addy's team pro #674706 must have an as yet, unclear separate explanation.

I am personally very glad there are others online that have enthusiasm for chasing the Holdsworth numbers, although I can picture other Holdsworth fans' eyes glazing over when talking about these nitty gritty perhaps boring details!