Who are these people?

[John Upham]

Who are the older two persons at the rear of this photograph?

At the front we have

SD Brown, RF Holmes, RA Cannon and AJ King.

Who are the other two?

This is not a quiz!

SD Brown, RF Holmes, RA Cannon and AJ King and ? and ?

IMG_0303.jpg (1.69 MiB) Viewed 144 times

[James Pratt]

This is a guess, might they be not chessers exactly but IT boffins? I therefore wildly offer Eric Hallsworth. Actually I have no idea but surely one of the others pictured can help John.
James

[John Upham]

John Cox has suggested (in another place) that the bearded person is Colin Crouch.

This looks most plausible unless you know better.

J.

[Leonard Barden]

I think Bryan Threadgall is the bearded person.