How funny to find the apostrophe described as a ‘notoriously difficult punctuation mark’ in last week’s Letters. It’s simple. So, the simple reason that St Thomas’s Hospital should be spelt with the final s is that it is pronounced by everybody as tom-ass-is, and the spelling must reflect that.
I agree that Earl’s Court is, as the Underground philosopher Anne Wotana Kaye suggests (Letters, 14 June), a deeper problem, for historical reasons.

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