Without actually having seen that programme and just going with your information, I'd hazard a guess at a Handley Page Herald in the red & white livery of Eastern Provincial Airways*. I'm obviously open to other suggestions!
Now I'll have to wade through YouTube to find that particular episode.
Edit: *Of course, also depending on the date of the interview with the investigator!
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Last edited by seafire6b; 28th Dec 2015 at 10:40.
Reason: Timescale