Members of the British Royal Family often attract criticism for not joining in with large gatherings of European royals for events such as significant birthdays. However one expert has said that this is entirely unwarranted as it would be far better to see the royals continuing to work hard at home and shining a light on their various charities.The argument has reared its head again after Prince Christian of Denmark celebrated his 18th birthday and was photographed with four future Queens - the latest in a long line of photographs of European heirs without any British royal in the mix.