Anything by Elizabeth Bowen, who wrote well of London in WW2, and also romances set in Ireland.
The 'Eustace and Hilda' trilogy (incl The Shrimp and the Anemone - I agree this works perfectly as a stand alone novel) by L.P. Hartley.
I have an anthology of Patrick Campbell articles - very funny, witty, well-written. He was a frequent panelist on 'Call My Bluff', a funny old show, and also wrote for various newspapers.
'The Riddle of the Sands' by Erskine Childers.
'My Antonia' by Willa Cather.
YY to Mrs Pepperpot!
The Moomin books also (Scandinavian theme here)...
More children's books - 'The Grey Goose of Kilnevin' and 'Orla of Burren' by Irish author Patricia Lynch. I read both many times as a child.
'Farmer Boy' by Laura Ingalls Wilder - an account of the childhood of her husband. I like it far more than the Little House series.
All the Winnie the Pooh books.
Agatha Christie mysteries.
Thank you for this great thread!