The action on 11 November 1940 is described in details on this site:
http://surfcity.kund.dalnet.se/falco_bob.htm
Wells is credited here of only one damaged Fiat CR.42.
Other pilots claimed 5 Italian fighters shot down and 3 crashed in GB or nearby, while two other were destroyed in crashes in occupied Belgium. So the claims were accurate for this category.
It is possible that more Italian fighters were damaged beyond repair.