I lay on the ground staring at some suspicious wet patches under my bike on the newly cleaned brick setts!
Turned out to be coolant dripping from the vent pipe onto the undertray then tracking forwards before dripping off in three places.
Dealer can't explain it, the coolant is at the correct level after its service last month so I'm baffled. Wiped it off, gave it a good thrashing for an hour or so and this morning it is spotless!
Brian (who thinks the evil fairies get under the cover in the night)