This series, Inspector Morley Late of Scotland Yard Investigates, was the source of the late Tod feature film compilations known as King of the Underworld and Murder at Scotland Yard.
There's a bit about the series (which doesn't even have an Imdb listing) here: http://www.78rpm.co.uk/tva.htm#morley
Several episodes have now turned up on YouTube:
The Red Flame:
Murder at Scotland Yard (not the film version):
Reilly at Bay (this one seems to be a fairly recent discovery as it isn't listed as one of the 6 surviving episodes listed in the 78rpm article above).
Now you too can enjoy Tod Slaughter's Dark Passage...
https://www.youtube.com/watch?v=I8nUqMHCEV8
Nice one, Mal, will check them out.