These waspish and sometimes catty diary entries are a valuable historical record. Like quite a few diarists, the author was from a fairly socially elevated level, but not so well-off financially (though such things are of course relative). He was thus able to mix freely with friends and acquaintances from Eton and the landed gentry and aristocracy (he was for decades the National Trust country houses expert) as well as with artists, writers and the cultural elite in general.
At times a bit of an old woman in his peevishness, the diaries show a more reflective Lees-Milne than that of earlier years, when it might have been said of him (as of Julius Caesar) that he was "every woman's man and every man's woman"...his affairs were many in his youth and he does not deny that, though he says that he is as against the gay proselytysers (his words, my mis-spelling lol!) as the prudish critics of the gays.
The diaries cover a vast field of culture and the arts but, when he tries to comment on political or social matters, he often goes astray, even within the terms of his own "reactionary" beliefs. for example, he is a great fan of that sweeper-away of English tradition, Mrs. Thatcher, whose policies and beliefs are poles apart from Lees-Milne's worship of the traditional and accepted...
A good read, like most of his many diaries.