Hi Nick
According to this link I found via google (which says 31,300 results for him) he was a rear gunner - no squadron of course, nor a date for the crash unfortunately
http://www.famouswelsh.com/Welsh-Act...tv.php?fwp=419
"My father was a cousin of Talfryns. I recall he told me that Talfryn was a rear gunner on a bomber that crashed in the war following this Talfyn had 'shell shock' and initially took up amateur dramatics to help his recovery. Best wishes with the biography"
cheers
Allan