Finally got provoked into getting the bathroom scales down, & can report my Mercury comes in at 13.5kg. Hmmm, it rides faster.
Differences between mine and the photo are; I have SON dynamo & Schmidt lamp, bottle cage, Lezyne frame pump, front disc, Panaracer 700x28. My saddle bag is about same size, Ergo grips, rear lamp & saddle (Spec Toupe) are all the same or v similar. Other major diff is the paint on the Audi A6 is less pristine and we don't have any floor surface that clean. I'm going to do a Sherlock on T1PAU's domestic sit.!