Video. King’s Swan Upping on the Thames shows healthy cygnets but rising litter

• The event, called Swan Upping, is an annual census of the Thames mute swan population running from 13 to 17 July, from Sunbury Lock in Middlesex to Abingdon Bridge in Oxfordshire.
• Barber, in the role since 1993, said this year's count was encouraging, continuing a tradition dating bac