The Epping Ongar Railway said "Supercar will be out and about this summer, attending a number of functions and making some surprise appearances… so keep your eyes peeled and cameras ready…. Next week Supercar will be at the Bus Rally on 1st July at North Weald airfield, when there will also be a special shuttle bus linking the railway and Bus Rally, details from the timetables page on our website."
There were a number of posters around at the time advertising the virtues of the CapitalCard (see the one pictured below that I found at Richmond station).
But I never knew that an actual real Supercar had been produced. Hat Tip IanVisits who found that the Epping Ongar Railway had unveiled its appearance again.