Where is it?

Three heads of navigation all visited in the same afternoon by the same two narrowboats:

1. This is the current head of navigation, but work is underway to extend navigation beyond the bridge. Where is it?

 

2. This also used to extend a short distance further. Where is it?

 

3. This is the physical head of navigation, but actually a short distance beyond the legal head of navigation. Where is it?

 

And one further clue:

This is the means of opening the top gates on the nearest lock to three locations pictured above. What is the name of the lock? (It has two alternative names).

Click here for the answers.

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