I have had a cold, and been off for the holidays as it is, so for the heck of it, I went on IMDB, and checked the credits out for the first couple of seasons of UNCLE, and found that in TMFO's first season, except for a couple of episodes, almost every Man from UNCLE show had either an a) Trek director and or b) Future Trek guest star or regular! And quite a bit of the time both!
The directors we know - and between the three of them, they directed almost all the first season shows - were Hershel Dougherty, of Tomorrow is Yesterday Trek fame, Corbomite Maneuver director Joe Sargent, and Marc Daniels, who did about 8 UNCLE shows, including one with Jimmy Doohan - remember this was 1964. Sargent was in all likelihood THE Man From UNCLE director, doing more of those than any other director. It was Sargent who directed the famous/infamous "Project Strigas Affair" episode, where Shatner and Nimoy appeared together first. (not to mention Werner 'Colonel Klink' Klemperer)
Felton and Roddenberry thought a lot alike!