The official Royal Air Force account states that:-
The ceremony also involved ten Standards ...of Battle of Britain squadrons still serving in the RAF today (see Notes to Editors),
although I'm not sure that Stradling would have recognised its description of the Standards being:-
military flags carried on poles
perhaps it was to differentiate them from the bosses' cars.
No idea which ten of the RAF BoB Squadrons still serve, nor in what context. We should simply be grateful that they do, I guess.
http://www.raf.mod.uk/news/archive/r...rsary-10072015