Articles (used for reference only)

Stoneleigh and Cheam memorials
- Nonsuch park. Epsom & Ewell History Explorer.
Photo of Stoneleigh memorial ca. 1930s (incompletely labelled).
Mention of Cheam memorial car crash article which is also linked below.
https://eehe.org.uk/25296/nonsuchpark/

Stoneleigh memorial
- Waymarking article
Mentions fountain for Stoneleigh memorial is defunct.
https://www.waymarking.com/waymarks/wmNTDM_Charlotte_Farmer_London_Road_Ewell_Surrey_UK

Cheam memorial
- Cheam, Nonsuch Park, Bellgate Entrance 1925. Francis Frith Collection.
Mentions Cheam memorial was moved.
https://www.francisfrith.com/cheam/cheam-nonsuch-park-bellgate-entrance-1925_77073
- Car crash destroys Victorian monument at Nonsuch Park. Your Local Guardian. August 27, 2013.
About Cheam memorial
https://www.yourlocalguardian.co.uk/news/10635908.car-crash-destroys-victorian-monument-at-nonsuch-park/
- Cheam Monument Begins Restoration Two Years After Destruction. This Local London. January 8, 2016.
Mentions remaining foundations.
https://www.thisislocallondon.co.uk/young-reporter/1877/

See also Geograph (mirrored on Commons), Commons and Historic England entries.
There do not currently seem to be (local) Historic Environment Records for these memorials.