W1T: 12 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in W1T, W1T 6YJ, stands 12 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, W1T 6AD, stands 22 m above it.
- Ground at eight in ten of its postcodes: between 26 m and 28 m, measured from Ordnance Datum; the middle one stands at 27 m.
- None lies in the Environment Agency's Flood Zone 3 from the sea.
- Mostly in Camden; partly in Westminster.