Re:
Umm... Although I reckon you know all of what follows already, you may have clouded the issue a bit there Shaun!
The link in my post reveals something of the convoluted situation in Holdsworth land. There was the factory, and there was the shop (both of which built framesets). My understanding (which I admit is entirely based on information at the link) is that they had some sort of symbiotic relationship, but were sometimes at loggerheads, especially with respect to these top-end framesets. So much so that in the end the shop was obliged to stop using the name 'Holdsworth' on their frames at all, which henceforth became 'Roy Thame(s)'.
My understanding is that the 'chunky wraparounds' were exclusive to the shop-made frames handbuilt by Reg Collard, and later by Tommy Quick.
I'd assume that 'the largest Bike company in Scandinavia', would be dealing with Holdsworthy (the factory) rather than W.F. Holdsworth (the shop), and that, rather than being strictly handbuilt by one framebuilder, this would be a factory-made frame, - i.e. someone brazed the forks, someone else brazed the bracket, etc.
If I understand correctly, the factory never built 'Roy Thames', and the shop never built 'Super Mistrals', (although they might be on sale there). Both the factory and the shop built a 'Professional'.