There is a suggestion that the glacial gradient from South Wales to Stonehenge was sufficient for ice to flow along it:
From https://brian-mountainman.blogspot.com/
Just a reminder that during the last ice age the Bristol Channel was above sea level and was a deep wide valley. Glaciers flow downhill so rather than the ice floating up the channel and landing on the Somerset coast from south Pembrokeshire it would have followed the gradient.
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