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Te limpet on the right could well be P.depressa which is characterised by well developed posterior lateral ribs on the shell and an apex about 1/3 the shell length from the front.
I'm far less sure about the animal on the left it could be an old high shore P.vulgata but many P.ulyssiponensis can look like this. Did you look at the foot colour or mantle edge tentacles?
Lat/Lng: 50.363948, -4.145983
OS grid ref: SX474537