The CASA that is here now, acmech1954, was delivered to Duxford in the 1990's so the one that you saw would have been a leftover from the B of B film in 1968. It's admittedly in a poor condition, having been stored outside in Spain for a long time, and I believe the IWM have surveyed it and declared it to be unsuitable for restoration at the present time due to extensive corrosion.
So, it will no doubt be disposed of as well, again hopefully to a museum who can 'tart it up' (and I do mean that in a serious and sympathetic way) either by making some dummy Daimler-Benz shaped engine cowls from fibreglass and painting it as a Heinkel, or doing it as a CASA with the Merlins. Either way it would be better than what it's undergoing now.