Gerry Finley-Day (writer)
From Action No. 51 with 3 black & white pages. Britain's Ace Secret Agent Is Inside! (Dredger - Deadly! Ruthless! Explosive! Dangerous! Gun-Happy! Exciting! Reckless!) Brady sends Dredger to the Nick on a mission to find-out if a convicted spy has any information. They escape and Dredger gets the info and brings it to DI6 HQ. He has a surprise film to show!
Here are the pages I have of it.