Based on a Global Express business jet, the RAF’s Sentinel battlefield surveillance jet has plenty of lumps and bumps to distinguish it but the paint scheme is a different story.  It is painted plain gray and, aside from one example I saw at Red Flag, it doesn’t have any interesting squadron markings.  The Friday of RIAT was a very wet a dreary day but this had the effect of making the Sentinel look rather glossy.  I have never seen them look too interesting before (aside from Red Flag) but this looked okay.  I did shoot it departing too on an overcast day and it didn’t look too bad then so maybe this one was fresh out of the paint shop?