Thanks ****ie. This morning I spoke to a guy at that phone number who I think must have been Liam Biggs. He told me they were working on an XKR 2007 at present using a prototype system and hoped to have some firm answers in a few weeks. He suggested I call back then. In any case, if it works then it will be February or March, I think he said, before production versions will be available. I'm happy to wait.
Thanks for the tip on the videos although maybe they won't apply precisely to what is coming for the 2007 XK. I'll take a look.
Mike