This is what was bothering me. It must have been '74 when the (proper) roundels were being changed.
http://www.avrovulcan.org.uk/1_group...on/653gv74.htm
Blurb says - Avro Vulcan B2 XM653 of the Waddington Wing after the 1974 SAC Giant Voice bombing and navigation competition with the three trophies won by Vulcan crews. Though the picture is somewhat soft, the Union Jack can be seen on the fin and the 1 Group panther's head between the roundel and the engine intake.
653's markings are unusual in that it has gloss green/light sea grey topsides and white underside with red and blue roundels.