Quick update:
Phoned my dealer yesterday.
"Yes Sir, the person who will deal with that is not able to speak to you now, give us your name and number and we'll get back to you"
5pm came No call.
They close at 5:30 so tried ringing them a few times ... answerphone .... didn't bother to leave a message as they're usually a waste of time.
Impression gained - "they're going to give me the run-around on this"
This morning came.
My mobile rang .... it was the dealer!
Explained problem again.
"OK sir, we'll have to order a new one for you, leave it with us and we'll get back to you as soon as we've got it and can arrange for you to pop down so that we can fit it."
Now unless they try to charge me for it, I'm really happy.
Dealer is a bit far away so I may see if they'll post the light up so I can fit it myself (and try to keep the other for European trips - being as I'm saving the trouble of fitting it)
Failing that, I'll have to drop it off and pick it up later so I'll see whether they can lend me a demo Shiver or a 1098 or something nice while they fix it.