It must be acknowledged that all of the flight-worthy F3F's are reproductions, using original identities. One of these is even a reproduction of the G-32, the two-seat version, which is owned by the Friedkin family. It is on public display at the Valle, Arizona location of the Planes of Fame Air Museum (has not flown in a number of years). If you are able to get in contact with the Valle, AZ location, they might be willing to snap some shots of the cockpit.
http://planesoffame.org/index.php?page=valle-az-location
This is the aircraft:
https://www.flickr.com/search/?q=Planes of fame valle F3F
There aren't any F3F's based at Duxford, though a couple of the US-based examples were shipped over and flown at the Duxford-based 2001 Flying Legends air show - those being the G-32 N100TF (pictured in the link above) and the F3F N20FG, which were both owned by the Friedkin family at the time (a collection sometimes also referred to as "Comanche Warbirds" and "Chino Warbirds").
The F3F N20FG used to be often displayed at the Chino, CA Planes of Fame location, when owned by the Friedkins, but was purchased by Jim Slattery several years ago, of San Diego. The aircraft still flies and is a regular Planes of Fame airshow participant, but it no longer is based at the Planes of Fame Chino museum.
Kermit Weeks has one, which is also one of the flight-worthy reproductions (N26KW), at his Fantasy of Flight, but it hasn't flown in many years. If only this Fantasy of Flight video was a lot higher resolution, the photos would help:
https://www.youtube.com/watch?v=DkObaTKa4cs
There are only two F3F's that are flying/active today, those being N20FG (Jim Slattery) and N20RW (Chis Prevost), with both being based (privately) in California - N20FG in San Diego at Gillespie Field, and N20RW in Sonoma at Sonoma Valley/Schellville Airport.
There is some (again quite low res) cockpit photography of Chris Prevost's F3F in this video:
https://www.youtube.com/watch?v=4IndAsKBNa8