Oh, I have not seen a photo of Enright, too.
But now, a big surprise.
I'm identified who is this person in the photo below.
Joe Farrer (or John Farrer), according
official info pages in Mike's book "Bowler Hats and Kinky Boots".
Unfortunately, I absolutely do not know any biographical information about this stuntman, but now we can look at the list of Joe's works on The Avengers.
Episode "The Gravediggers"
Joe as one of Pallbearers (photo above)
Episode "The Master Minds"
Joe as Man in rowing machine
Episode "Castle De'ath"
Joe as one of Gillie
Also:
Driving Double for Tulip in episode
Who's Who???
Stunt Double for Chadwick in episode
Return of the Cybernauts (face of Joe is good seen)
Stunt Doubles for Alex and Danvers in episode
Dead Man's Treasure
Stunt Doubles for Barlow and Ketteridge in episode
All Done with Mirrors (face of Joe is good seen as stunt for Barlow)
Stunt Double for Vickers in episode
Super Secret Cypher Snatch