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@NotThamesWater
How recent? The more recent , the more accurate the prediction...
A 43:00 10k puts you in the vicinity of a 1:35 HM (and a 20:39 5k)
A 20:09 5k might scale to a 42:00 10k and 1 :32:00 HM
(Based on a pretty standard predictor for race pace)