This cache is a short walk from Tooting Rail Station. According to Hidden London, Figges Marsh has a lot of dubious stories attached to it. It's a triangular open space set between the London Road and Streatham Road, technically in North Mitcham – well known by driving commuters, with traffic regularly backing up along the roads during the rush hours, the sight of green space and trees is some small comfort to the weary driver 
Figge’s Marsh is nine miles from London, according to its 18th-century milestone, which is rumoured to have been removed during the Second World War in case German planes landed here and realised how close they were to the city centre. Named after William Figge, who from the 1350s held Pound Farm in sergeantry to the king. Present-day Carlingford Gardens and Manship Road mark the boundary between Figge’s property and that of the medieval Biggin Farm Estate. Swain’s Farm also stood near here and market gardening was carried on, which is evident in the large concentration of allotment organisations that still exist, with no less than five allotment gardens in hidden locations within a mile radius of the green, making it a popular area for keen gardeners and those interested in more sustainable living 
The ward of Figge’s Marsh has relatively high proportions of households with children and recent campaigning by locals has led to the decision to plant a hedge along the tree line on London Road to reduce the levels of pollution emissions affecting regular users of the space. In summer the most delightful wildflower patch is enjoyed at the north end of the green, not far from where the cache is stuck.
*UPDATE*.....Congratulations to *fire-star* for being a super-helpful FTF! and to *danoblivion* for a very worthy STF :o)
Happy Hunting!