It's a Great Crested Grebe, fabulous to watch, especially in breeding season with their bonding rituals
Thank you. I was surprised it is dull in colour. Is that it’s winter plumage or is it a juvenile or something?
Possibly yes to all 3 ... looks like a pic taken on a dull day, that won't help the plumage look lovely... I saw one in Studland Bay (south coast) in similar light Sunday