Now derelict, the site is only accessible through a hole in the fence and is probably unsafe or something so your author firmly recommends you shouldn't go there. Having said that, when your author visited over the weekend there were stunning views back towards Docklands and the centre of town and a neglected atmosphere which had a certain charm, in a largely charmless area.
It is, apparently, also worthy of Grade II borough site for wildlife, but considering that it is a green space in a lot of grey spaces this is probably understandable.
Plans to turn the site into an indoor ski slope apparently floundered recently when budgetary constraints meant developers simply couldn't overcome the massive contamination in the ground, so it looks set to remain an unloved bit of wasteland for a while yet, but one which certainly has something special about it.
For more information, visit http://en.wikipedia.org/wiki/Beckton_Gas_Works#Beckton_Alps.
Click here to see the location on a map.