Yellow on bill past the nostril.
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You can see a ring on one of the swans in your second picture. I can make out "E7S", may be worth reporting this.
Dear John, we were sitting next to a member of the RSPB who was noting down all the numbers and she also had a book which allowed her to say when and where they were ringed. But we did find a ringed Ruff and sent in the details of its rings! Thanks for the suggestion.
Lat/Lng: 53.6, -2.9
OS grid ref: SD4214