Judi Dench is fantastic at any roles she plays.
However, this movie was just disappointing at best.

Nothing but the same tired stereotypes of women.

Sad/lonely pathetic spinster with cats.
Predatory lesbian.
Prudish old battleaxe.
Emotional vampire.

Disatisfied housewife has affair, feels guilty, wants to return.
Lonley woman just wanting to feel ‘wanted’.
etc. etc.