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From their website: "We were founded by HRH The Duke of York, later HM King George VI, in 1925 as the National Playing Fields Association and are proud of our long heritage protecting parks and green spaces. Our Royal Charter in Incorporation was granted by HM King George V, our first Patron, in 1932."

Fields in Trust had a campaign: to "celebrate the Diamond Jubilee and London Olympic and Paralympic Games, as well as the 2014 Commonwealth Games by permanently protecting as many outdoor recreational spaces as we can by the end of 2012. All kinds of sites are eligible to become Queen Elizabeth II Fields." 

We cannot find a list of Queen Elizabeth II Fields on the Fields in Trust website. But others in London are: St Pauls Churchyard and a dozen adventure playground spaces in Islington, protected in 2012.

See also King George's Fields Foundation.