Did you see the helicopter on Monday? If you were in the eastern part of Wanstead over by the river Roding it was difficult to miss, if you couldn't see it you would almost certainly have heard it. It hovered in the same spot for ages, at first I thought it was the Police dealing with a problem on the A406. It turns out it was from the National Grid and it spent the afternoon slowly following the course of the power lines that run along the Roding Valley. Just checking I expect.