On Location (Scotland)

Indeed this film WAS completed in late '69.
I was twelve years old when on a Summer visit to House Of Traquair, (Oldest House In Scotland) I saw some exterior film scenes being shot!
It was a beautiful day and feeling peckish, helped myself to some food of the catering trolley! I was gently ushered off 'set' by a gruff old member of the film crew!!
However years and years later, I acquired a VHS copy, and recall the very one scene I saw being shot!(Between S.Beacham + Joanna Lumley).