Try searching on Richard's FB email address /richard.silvester.796

Otherwise, try going to the George Hotel in Leadenham tonight. It's the monthly '600 Whiskies' folk evening and Richard sometimes attends. If Richard isn't there, it's pretty certain someone will be able to tell you how to get in touch with him.

BTW, I searched on FB for 'Richard Silvester' and he popped up at about the third try.

Carol Dawson does give lessons, and she runs a fiddle club, but she's over in N.E. Lincs., in the Barton/Goxhill area, I believe.