Wrong side of the drag-curve with this, (posted 14 March 2019), but are you sure that is XV406 "M"??
In preparation for a Station Open Day, the Sqn had commisioned hundreds of "Squadron Prints" of the subject aircraft, and the plan was to have it on static display in the hangar; punters could then have their photo taken sat in the actual aircraft and buy a Squadron Print as a souvenir. Nice little earner for Sqn funds.
In the event '406 suffered an engine failure the day before the show and had an engine removed. We towed it across to the "sterile" south side of the airfield and hid it in a revetment. Next, an alternative aircraft is put on static display, fablon over its true markings, get the painters in and, voila, XV406 "M" has a doppelganger (on one side only).