Here is a sketch of Charcot House, one of the five tower blocks in the Alton West Estate, Roehampton, SW15.
The Alton West estate was completed in 1958, as social housing. It was designed by a London County Council team led by Rosemary Stjernstedt (1912-1998).
The five tower blocks stand in a huge green space, on a hill, with many trees. When I visited, people were picnicking on the dry grass. You can see some of them in the centre of the picture.
I went there by bike, it took about two hours, partly because I also went to look at the Dover House Estate, nearby, which was built in 1918. Also it took me a while to find the Alton West estate. There are a number of hills in the area.
Here is a map:
Local map 
Work in progress 
This lovely old wall pre-dates the estate, I imagine. 
The flats are maisonettes.
Drawing time: 45 min. Colours: Mars Yellow (DS), Phthalo Turquoise (W&N), Burnt Umber (Jacksons).
Jane Sketching 