As part of his work, he was fascinated by the history of commons, leading to him acquiring the title of lord of the manor of Plardiwick at Gnosall in Staffordshire.
Kate Ashbrook, general secretary of the Open Spaces Society, said: “It was our good fortune that Ronald selected the Open Spaces Society for his attention soon after his retirement.
“He worked prodigiously for us and our interests. As our treasurer he nurtured our resources, and he spoke out for the protection of green spaces in and around the capital.
“He is fondly remembered for the tireless manner in which he championed green spaces in and around London, for his detailed notes and his thoroughly-researched responses to government and local authority consultations.