According to the Defence of Britain Archive, these blocks by the side of the tram tracks were revealed when undergrowth was cleared in 2000, presumably part of the tramlink construction. There are seven blocks, or cubes, on the south side of the track, on the eastern side of the Willow Lane bridge, i.e. the hump back road bridge nearest to the industrial estate.
photo taken 29th August 2018
E.T. Pearson Ltd., who was at 417-445 London Road, made Lactagol, a powdered extract of cotton seed and calcium, which they described as
a valuable preparation for increasing the supply of milk when taken by the expectant mother
Nottingham Evening Post – Tuesday 13 December 1949
Image © Trinity Mirror. Image created courtesy of THE BRITISH LIBRARY BOARD.
The earliest ad for Lactagol on the British Newspaper Archive found so is from 1915:
Western Times – Thursday 21 October 1915
Image © Trinity Mirror. Image created courtesy of THE BRITISH LIBRARY BOARD.
ad from 22nd March 1918 issue of the Church Times
Science Museum Group. Carton of ‘Lactagol’, London, England, 1920-1955. A627904. Science Museum Group Collection Online. Accessed August 29, 2018.
The site acquired by Mitcham Borough Council in 1959.
Mitcham History Notes 