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As the parent indicated, this stuff is surprisingly standardised in London.

Distance is measured from Charing Cross.

The Cross is near Nelson's Column, but I would be surprised if the column was actually the central point.

As others have pointed out, this leads to some weirdness, as lots assume that the City (old London & older Roman London) would be the obvious place to measure things from.

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The original Charing Cross was at the south of the square, where the statue of Charles I is now. (The cross at the railways station nearby is a Victorian folly).

In a similar vein, for New York City the official highway distance to the city is measured from Columbus Circle [1].

[1] https://en.wikipedia.org/wiki/Columbus_Circle

In Edinburgh, it's the old post office building at the end of Princes Street.

Which is also where the A1, A7, and A8 meet.

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