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It does look like the tern 9th from the right which is facing the camera has a yellow tip to its bill. All have dark legs.
I don't think the distance and resolution is helping but on a blow up on a big screen I think I can make out several birds with yellow tipped bills.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 52.3618, -6.3692
OS grid ref: SM026827