Browsing the 'Beyond SE23' part of the forum I came across Steve Grindlay's link to bomb damage maps of the area. Forest Hill Station is visible at http://www.flickr.com/photos/stevegrindl...445257235/
Where the car park now is is marked in black denoting it as 'totally destroyed'. The southern bit, which I presume is the bit demolished in 1972, is Light Red denoting 'Seriously damaged but repairable'. Lots of the Light Red buildings on the map still exist ... I hadn't realised it was hit by a V1 - as was the house called Fair Lawn - where the school now is.