Teddington Lock Footbridges
The Teddington Lock Footbridges are two footbridges over the River Thames in England, situated just upstream of Teddington Lock at Teddington. There is a small island between the bridges.

The Teddington Lock Footbridges are two footbridges over the River Thames in England, situated just upstream of Teddington Lock at Teddington. There is a small island between the bridges.
Check the official site before travelling; hours and prices can change.
More bridges

Tower Bridge
The bridge people mean when they say London Bridge. Walk the high-level walkway for the glass floor.

Millennium Bridge
Foot-only suspension bridge from St Paul's to Tate Modern — the only crossing aligned on St Paul's dome.

Hammersmith Bridge
Currently pedestrian-only, Victorian wrought-iron beauty — best photographed at golden hour.
Source: wiki-list