That's a shot used in the Holiday Special and as far as I know, was shot during principal photography for Star Wars - the set seems to suggest so, though I guess it could have been constructed for the HS. Somebody else here might be able to tell us more. But hey, there is only one person who really knows!

Just to point out, I am happy to answer any questions you have but I am not the fountain of knowledge that I may have appeared to be. I simply research lots when doing these projects and I forget most of the info afterwards.

Best regards
JD