This little one was found in a group of 5000 dunlin at the high tide resting place near breskens in zeeland (south of netherland)
There are more pics an two movies that can be seen at:
http://www.vogelwerkgroepnovl.be/foto.htm
movie 1
movie 2
I saw a leucistic Dunlin a few years ago in Scotland, although it wasn't as pale as this one. Leucism seems relatively common in waders, although that might reflect how easy it is to see large numbers of waders than it genuinely being more frequent.