I'll pass on the extended warranty. I know it's contrary to popular thinking, but in the 10 years I had my K12S, I wouldn't have used it once, so that's a good £3k I've got in the bank. Besides, there isn't much I can't fix myself.
Brian - thanks for the heads up on the ABS ring - thankfully, it's only the pinch bolt (the one that shears) that was loose - the ABS spacer sleeve was and still is in the right place!
I forgot to mention last time - worst bit of all, the previous owner was a police force. Makes me wonder how many of their other BMW bikes are wandering around incorrectly serviced.