Personally speaking Jeanne, the most recent, and only attempt this year, was down at Croyde Bay in North Devon earlier this month, when on a holiday camp site.
Went for a jog along Saunton Sands, and then a skinny dip on a really warm evening.
Didn't bother putting on running gear afterwards, and being only a mile and a half from the site, ran back around headland along the Coastal Path then thru the camp site - that was the tricky part as it was a family site - don't think I was observed, but a couple of close calls.