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Vapourer has very distinctive 'shaving brush' tufts on its back which your caterpillar lacks. Also long tufts of black hairs at the front making a sort of Y shape and at the back making a pronounced upwardly pointing 'tail'.
See here http://www.ispot.org.uk/node/78799 for an example.
Lat/Lng: 52.7236, -2.8408
OS grid ref: SJ433143