Going by E7, 8, 9 & 10 being available on C5-VOD, that fits with a 30day CatchUp window covering the last 4 episodes.
I'd therefore guess that E4 was broadcast roughly around the back-end of November, start of December?
Your "recording hiccups" might list why this episode didn't record, but you'll probably have to go do a lot of scrolling to find out.
If not this, then could you explain further - I'm not seeing any issue here.
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