A bit of a long shot. Back in 1965 after Euravia/Britannia replaced their L.749 Constellations with Britannias, L.749 G-ANUR was leased to ACE Freighters at Gatwick. When that company folded, the aircraft was brought back to Luton on 14/9/66 and stored until departing to Coventry on 1/3/67, having been sold in the USA on 23/2/67. Does anyone have any recollections of where it may have been parked while it was stored, or even better have a photo? Only colour photo I can find is this one:-
Looks like it retained its basic Euravia scheme with no titles, just the ACE logo on the tail.