Not quite Pedants Corner, but perhaps worth a ponder?

I remember the other girls laughing at school at a new girl who had just arrived and saying something was "jolly splendid"!

So that was infra dig already back in the 60s.

Not on your nelly.
Or was that just a London thing?

Not on your nelly, was used in Glasgow too.

Gordon Bennet! I don’t hear that expression so much these days.
My grandmother would not allow me to say Blimey! because she associated it with Blind Me.

Cove, meaning a person. Always used by my husband (public school) and guinea gold, to describe a truly good person.

Chums; I have a friend, late eighties, who uses it regularly.

My (now deceased) Uncle Ronnie, usually added ‘what’ at the end of his sentences.

‘Shall we have a drink, what?’ Or as he enjoyed my mother’s cooking he would say ‘Delicious lunch, what’.

You never hear people use the word ‘what’ in that way, nowadays.