Wensleydale,
Your picture shows that the Vulc would've been ideally placed if it had been static. However, ISTR that the principles of camoflague/ concealment were:
Shape Shine Shadow Size Silhouette and Movement
- your Vulcan would've still stood out against its surroundings unless they too were doing around 240 kts in the same direction.
I'm currently finding that colour schemes meant to provide high visibility under all circumstances are - as commented by AR1, M the M and ExAscot - occasionally counter-productive. My bright yellow 135, when moving slowly along powerlines at around 30' agl, is invisible to nearby aviators/airfields when I'm anywhere near oilseed rape or even wheat/barley fields. The Filton Air Ambo, which is a particularly lurid green, was (this afternoon) like the proverbial dogs-bits when observed down-sun but invisible against most backgrounds if viewed into sun. As for gliders on sunny days... a real pain to see, despite (or, more likely, because of) the white colouration.