where is the best place to see the thames gateway and where the new flood barrier may be if neccesserry?

Question

ideally i want to see the mouth of the thames and where all the islands are where is the best place to do so

Answer 1

I think you are misinformed. The Thames Barrier doesn't operate very often (if at all as far as I know) and the only islands are actually mudflats on the tidal perimeter.