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The third photo looks most like a harbour porpoise. Did you observe how the animal was moving through the water, as that is quite diagnostic of the species - a 'rolling' motion, usually with the animal never completely breaking the water but they have been known to breach (rarely).
OU Certificate in Contemporary Science
lovely photos they are so hard to photo popping up and then disappearing!
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Yes they were exhibiting the rolling behaviour you mention Gill, which makes it quite difficult to get a picture - these were the only three which came out any good within many shots of just water!
Lat/Lng: 56.7, -5.2
OS grid ref: NN0771