It was actually very moving.
Dot is from a generation who 'got on with it' and notions like love and affection were simply not thought of, much less discussed. because of that she has grown up into a person to whom expression of emotion is next to impossible - until the medium is given to her - a chance to simply talk about herself without interuption or judgement, and she took to it like a drowning man takes to a lifeline.
June Brown is a fabulous actress. She knows that TV is about nuance, not movement, it's in a vocal inflection, a twitch of facial muscle, and as a mansterclass for the rest of the cast, it was all there to see.
I didn't see all the episode, but enough to know that younger viewers, used to quick-speed instant delivery will find its place funereal, and its message lost, but the more, ah, senior among us may have thought about the way we communicate with those we love, and that leaving it until it is too late is not something to take on lightly.