The Duke of Cambridge waas also ful of praise for the portrait.
Prince William said:: "It's beautiful, it's absolutely beautiful."
The Cambridges later attended a private breakfast reception at the London gallery to mark the unveiling.
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Rimell Taylor was jailed for 21 months for dangerous driving, driving while disqualified, driving without insurance and drink driving.
A fundraiser from Milton Keynes has been crossing the region by kayak. Graham Durcan started in Norfolk on his 130 mile trip.
After a few spots of rain in the early morning it will be dry with hazy sunshine developing