After 4.5 weeks, the story has changed yet again. Now I'm being told that there is no shortage of parts but that Triumph UK withheld the parts telling the dealer to soak the clutch plates in oil instead, thus only authorising them for the labour cost.
sh#t - if you're going to take the clutch apart, why not change it? Soaking the plates will make no difference to the problem I'm having.
My dealer agreed and said they're now going to "appeal" with the warranty people at Triumph. They said if that fails then they're going to go to the factory rep.
I have to say I had misgivings about not buying Japanese or German. I then thought I was wrong, having ridden the bike for 6 months or so.
It seems my concerns were right though - this is just idiotic. I love my Tiger but this warranty issue has taken the shine off Triumph for me. My next bike will be German or Japanese again.