The last collier brought its load of coal to Wandworth in April 1970, and gas production there ended in May, but the gas holder remained in use. After the UK conversion to natural gas was completed in 1976, these structures became redundant, as gas could be stored in a fraction of the space in liquid form. Though I'm no expert (though I know people who are) there seems to be nothing particularly deserving of retention about this fairly recent structure, but last time I looked it was still there. Perhaps the site is so toxic the cost of rehabilitation is extreme.
 
The road layout has changed slightly around here with the opening of Swandon Way, and given the amount of of traffic this now carries, playing a game here would now be suicidal. But I don't think this was a goal marked or used by kids, but I think probably for a film or photo-shoot. We never felt any need to mark the goals we made with the word 'GOAL' and the lettering is also suspiciously clear.