Kenwood: December 1968 (& August 1967).

It is hard to say exactly where a lot of the December '68 shots were taken, beyond "somewhere in the grounds". However this photo, one of a number of similar variants, is pin-downable (if that is even a word); namely, directly outside the sunroom, looking towards the dining room. You can see those distinctive stripes (and the dining room window), also evident in the August '67 shots. (I wouldn't bet on it, of course, but that bit of Kenwood seems to have survived intact from 1913 to the present day, too).