As you can see HERE, there is a map of London with DB maps. But Dome and exec maps are missing.
I made this suggestion of execution map placement.
http://i.imgur.com/Ol2DoZL.jpg
Execution is about destroying pylons and pylons make containment shield together (yellow circle).
Market - Spawn of attackers is in dry riverbed so I placed it on river Lea (according to google maps, I have never been to London). River Thames is still full of water as you can see on terminal (behind defenders spawn on 2nd objective)
Overground - It should be placed near trainyard on yellow circle because of railroad, there is also dry riverbed. (so maybe River Brent ??).
Dome - There are also pylons so Dome has to be placed on yellow circle in some industrial area.
