The earliest newspaper mention so far found on the British Newspaper Archives is from 25th May, 1717:
Whitsters, according to this news item from 1749
“On Saturday Thomas Wiltshire was committed to the new jail in Southwark by William Hammond, Esquire; charged on oath, and his own confession, with feloniously taking and carrying away a large quantity of Dowlas from the grounds of this Messrs Wood and Deacon, of the parish of Mitcham, Witsters.”
Eric Montague says that “Mr Wood’s Silk Mill” is shown on a map of 1831 near to Wandle Villa. Page 41 of Mitcham Histories : 8 Phipps Bridge, 2006 edition.