[Pedro the Fisherman]

As a couple of your samples suggest, but you might not be totally aware, Brighton's nude beach is an end point for that city's iteration of WNBR, the World Naked Bike Ride; here's an example, I suspect by our own esteemed Pedro the Fisherman (though I found it somewhere he almost certainly didn't submit it to!). If you haven't already, then, you might search within OCC WNBR threads for Brighton; flickr user marcin_gda2 is another possible source...

Yes, I took that photo! Brighton WNBR 2009 and the girls actually stopped their picnic to stand up and pose for me, when I asked if I could snap them.