A mystery at Eastleigh, 25th March 1984

In the midst of the BR Blue era, when the only colour schemes were all over blue or blue and grey, these two Mk 1 pattern doors were seen through the fence at Campbell Road. One was a green and cream, with the first class indicator in a circle, and the other a more battered red. I think that they were around here for a few weeks. Does anyone know what the reason was for these? My email is at the bottom of the page.

UPDATES: It matches the West Highland LNER Tourist Livery, but that rake was painted a year later in 1985, and the number style does not match. Apart from paint trials, the best suggestion so far is that these may have been from the Exhibition Trains unit at Salisbury. Your input remains welcome.