paul....I've googled some of the cases and up popped what has happened to the suspects....and in some cases the outcome, when the coppers have failed to solve the case....didn't know it was on UK TV....they just started a new season last night.
sometimes on my day off...they will run 4,5,6 episodes back to back....even some of the reruns are cool to watch.
from what i have seen....a lot of the cold cases are solved by anon tips called in to the "crimestoppers " hotline.