Squirming writhing mass of leaf litter critters
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Thanks for that. The photos on EOL show more spikey larvae - apart from that it fits. I'd not seen this before, quite something! It helped having younger eyes nearer the ground i.e. 2-7 year olds!
I certainly know about St Mark's flies having identified them in my early teens in the lanes of West Cornwall - not great when cycling through them at speed!
Lat/Lng: 51.2344, -0.5088
OS grid ref: TQ042494