Michael A. Jolles reviews Keith Pearce's "The Jews of Cornwall - A History" on page 7 of Kehillat Kernow magazine: http://kehillatkernow.com/wp-content/uploads/2014/07/Kol-Kehillat-Kernow-38-August-2014.pdf 

The Jewish Chronicle obituary of Godfrey Simmons, for many years Custodian of the Penzance Jewish Cemetery https://www.thejc.com/news/obituaries/godfrey-simmons-1.447251

Here are some other useful links:
http://kehillatkernow.com/burials-cemeteries/cemeteries/penzance/
https://www.penleehouse.org.uk/visiting/other-places-to-visit/penzance-j...
www.penzancetowncouncil.co.uk
http://www.jewishgen.org/jcr-uk/susser/penzancecem.htm
http://www.cemeteryscribes.com/showmap.php?cemeteryID=30