On Wednesday we decided to have a look for ourselves and went down to Marloes. The three birds were there alongside the road in the 'alternative' site marked in the Pembrokeshire blog. The only problem I had was that I was photographing straight into the sun - so here is one of my efforts:
Taken with my Canon 500mm lens - no converter / extender - ISO1600 (why?) f8 @ 1/1250sec.