"That is obviously a very subtle hint to Nick 'n Rik to speed up....."

I suppose you could see it that way, but that was not my intention.  I just find the work Retropower does very interesting. As with BOM, I've learned a lot from them.

"I can't help thinking it would have been better to go for 14" steel wheels and hubcap (Zephyr?), and allow bigger discs. But that is a minor quibble on what will be a truly special car ."

I'll have to re-watch the MK1 series to see what you mean about the wheels & tires.