Lovely Matt- great weathering job, something I'm not good at. It's always good to see other people's models with which to take inspiration!
As an observation (not a ctitisism) is the armament. There are plenty of pictures of Vc's being delivered with 4x20mm Hispano cannon but not many in action with this combo. "Spitfires Over the Mediterranean & North Africa" (a Del Prado reprint of an Osprey title) shows several aircraft so fitted but says on p.12 that on one delivery at least, only two were loaded to save weight. My understanding from somewhere is that two cannon were removed on arrival to lighten the airframe. Photos on p.17 and 18 show aircraft with only two cannon; it's not possible to determine whether those on p.17 are Vb's or c's, but that on p.18 BR586 "T-M" is a Vc. It is entirely possible that some had the 4x20mm armament as operational needs on Malta may have dictated this, but if anyone else can prove one way or another that T-B had this combo, can they share the info with the rest of us?
Sorry but I'm not a rivet counter nor a member of the Spiterati (honest!), just curious as to whether there is a definitive answer. After all Malta was a hell hole and the last thing on anybody's minds was to take time out to write things down with one eye on history.