Re: 147 JTD servicing in/near Leeds?
I asked independants Kershaws this question a couple of years ago when mine was needing warranty work, and they said 'No' - they couldn't do warranty jobs. I assume this is still the case.
Incidentally, Kershaws later fitted me a replacement (genuine Alfa) flexible exhaust downpipe, after which a resonance developed at certain revs. The pipe was suspected, but when they ordered another new one, Alfa wouldn't take back the 'faulty' one unless a genuine Alfa dealer confirmed that it was indeed faulty. This seemed unreasonable at the time, except that it finally turned out that the resonance was caused by a fractured bracket and nothing to do with the pipe!