That's a Goosander I'm afraid. The white line indicates a young bird. The head pattern and colour and the body colour are right for Goosander but not for RB Merganser. Mergansers have a paler, more orange-brown head that merges with the slightly more grey-brown body. They also have a spikier crest and are noticeably smaller.Is this your Merganser? (I'm still learning!) It doesn't have a diffuse border but its beak doesn't look as hooked. Is the white stripe below the eye significant or just means it is a youngun?
Does the white chin mean goosander?
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It was on its own and swimming around Skates Nose so it is mostly wishful thinking.
Red-Breasted Merganser Identification
Red-breasted Merganser -- Length: 23 inches, Wing span: 30 inches
www.birdzilla.com
I didn't see the Merganser earlier today, so it may not have been around. I did, however, count 104 Goosanders, which is a site record, I think. Most of them were roosting on the North Pier at low tide, before swimming off into the harbour. Also about were a Whimbrel, three Dunlin and a Black Guillemot.