BR6: 45 m clear of the highest tide in the London Bridge ledgers

The lowest postcode in BR6, BR6 0HS, stands 45 m above the highest tide in the London Bridge ledgers (5.41 m, 1 February 1953). The highest, BR6 7LA, stands 174 m above it.
- Ground at eight in ten of its postcodes: between 58 m and 116 m, measured from Ordnance Datum; the middle one stands at 90 m.
- None lies in the Environment Agency's Flood Zone 3 from the sea.
- In Bromley.