You've had some cracking cars and bikes!
As regards the TR6C it depends where it came from. As has been said above, 8000 UK miles wouldn't clog the trap, but (as I know from personal experience) bikes imported from the dry states of the US often have traps full of crap. I think it was a macho US thing to run air filterless (and front brake-less, rear suspension-less, front mudguard-less etc etc
) and this causes problems.
I think on a bike as desirable as this, I'd go for a winter strip and check, just to be safe.