Battersea as far as I'm aware does not have a radar, and whilst they are very professional I do not think they are trained to the highest standard of say an airport radar controller.
And do you know how many obstructions there are in London TMA, NOTAM'd or otherwise?
All this aside this is all conjecture until the facts are known, we don't know where he was going what he was doing or the state of the aircraft before it hit anything.
So whilst all the arm-chair budding AIB investigators dig out weather reports etc, just calm down take your hands of the mouse button and wait till Jeremy Vine and his cronies sort the facts out but most of all have some respect!