In the Netherlands I live near a place where you can see them almost daily from the shore. I've been there about 20 times and saw them at at least 15 times ! It's near Zierikzee and the population in this area is about 18 animals.
I was talking to someone from the Yorkshire Wildlife Trust the other week who said there are good numbers off the Yorkshire coast. I have not seen a live one since 1995 when I saw two off Scarborough as I walked around the headland. A few days later I saw a Pilot Whale near Scarborough harbour (it made the local press). I have seen a few Porpoises washed up on Bridlington beach since then. Apparently there was one a couple of days before I was talking to the YWT person.