Wandsworth Park is a Grade II listed urban park in the Putney district of London, England. The park is situated along the south bank of the River Thames and bordered to the south by Putney Bridge Road. Wandsworth Park was purchased for £33,000 in 1898 by London County Council, Wandsworth District Board, and by public subscription. The land was previously allotment gardens. It was designed and constructed under the supervision of Lt Col John James Sexby, the first Parks Superintendent for the London County Council. The design is dominated by a 3.5 hectare playing field in the centre of the park surrounded by an oval path. The south east corner has a more ornamental design, and an avenue of trees form the northern edge along the river. The design has remained largely unchanged since its construction. The park was formally opened on Saturday 28 February 1903. A bowling green, pavilion, and tennis courts were added in the 1920s.
(Info from https://en.wikipedia.org/wiki/Wandsworth_Park)
The cache is a small vitamin pill container with label, tied with blue string. Please be careful when you try to reach (maybe some thorns there) and put it back to its exact place.