If you haven't tried the quiz, have a look here first! If you have, the answers are below.
1.

2.

This is the Ha'penny Hatch footbridge and (formerly lifting) rail bridge over Deptford Creek.
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4:

Did the clue help? This metalwork knot is on a grave in Brompton Cemetery, close to the final resting place of Emmeline Pankhurst.
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