The Prince and Princess of Wales surprised NHS staff by dropping in for a tea party at a London hospital.William and Kate added the finishing touches to cupcakes and helped lay tables at a reception at St Thomas' Hospital to celebrate the health service's 75th anniversary.

The Prince and Princess of Wales surprised NHS staff by dropping in for a tea party at a London hospital.William and Kate added the finishing touches to cupcakes and helped lay tables at a reception at St Thomas' Hospital to celebrate the health service's 75th anniversary.