While I agree with some of what Colin has said I cannot agree with everything. " if Triumphs become too expensive then prospective owners will move on to something cheaper; we’re left with cars that swallowed huge amounts of money on rebuilds but won’t reach anywhere near that on resale." If this was the case then owners of good tr5, tr6, e-types, and numerous other makes would be stuck with there cars but this does not seem to be the case. Even when there was a boom and bust economy in the 90s the bust did not last long as prices in classic cars started to rise and overtake the prices they had reached at their peak. Properly restored cars will always sell, they just don't change hands as much as the more poorly treated ones due to people thinking they can buy a "good" one cheap and then realise that they need to spend a lot more money in up keep.
Oh and please excuse my ignorance but who is or was Hugh Robert ?