LONDON — For anyone with a Black Friday and/or Cyber Monday hangover, Heywood Hill has the answer.

The beloved Mayfair bookshop, where the novelist Nancy Mitford once worked behind the counter and where John le Carré set one of the scenes for “Tinker, Tailor, Soldier, Spy,” is turning 90 next year, and marking the occasion with an edit of the best British novels published since 1936, with a new international subscription that promises pure immersion — and escapism.

The shop, in a Georgian town house on Curzon Street, may be tiny but Heywood Hill is known to readers worldwide as an “oasis for thought, and a place to cultivate a personal relationship with books,” according to its manager Nicky Dunne, who co-owns the shop with his father-in-law, Peregrine “Stoker” Cavendish, the 12th Du

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