Hi all, sorry for the late post about this - I didn't have time earlier between getting in from work, having tea and going straight out to BBG!
I was passing Black Rock at lunch time and decided to call in to make the most of the high tide and calm weather. I viewed from the west end of the beach (Criccieth end) and most of the birds were close in. After good views of 5 Long-tailed Ducks I was scanning through the many Common Scoter to see if there were any Velvets or Surfs in the mix when I was stopped dead in my tracks by a drake scoter with a chunky blob of orange/yellow on its bill, just before it dived. I waited for it to resurface to check it wasn't just a 'funny' Common and after longer views was happy to phone it out to Alan and Marc as a Black. It was one of the closer birds to shore, often staying on its own, but occasionally chased about by drake Commons. It was also keen on displaying to a female Common, who seemed to be enjoying the attention, which raises some interesting questions about possible hybrids!
I managed a few very much record shots using my phone handheld to the scope: