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...looks very much like dolphin pos common rather than porpoise. Fin too. Will be corrected, there are experts out there that know more than me.
No it's definitely a porpoise, we saw several feeding, porpoise don't show their heads above the water line when they breathe, they were the right size too.
...happy good to offer ID then :)
Fairly typical of porpoise - the dolphins that occur in UK waters all have falcated (hooked) fins - a good spot piggehwoo harbour porpoise is a difficult species to see as they are very discreet
Lat/Lng: 56.22, -5.86
OS grid ref: NM607097