The Irish Guards' regimental mascot, Conmeal the Irish wolfhound, was given his own sprig of shamrock by the Duchess of Cambridge.
The St Patrick's Day tradition dates back to 1901.
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Claire Ptak said she was thrilled to be chosen to bake the royal wedding cake of organic lemon elderflower.
The CofE is making portable card readers available to more than 16,000 churches.