A photographer who has been accused of "harassing" Prince George by the Duke and Duchess of Cambridge has denied any wrongdoing will continue to take snaps of the 14-month old.

Lawyers for Prince William and Kate Middleton accused two members of the press of intruding on the future king's personal life as he went about his "ordinary daily" life with his nanny.

Kensington Palace said the royal couple threatened legal action after they spotted a man near Prince George in a park in central London.

The Palace added it had reason to believe one of the photographers, Niraj Tanna, had been placing Prince George "under surveillance and monitoring his daily routines for a period of time".

A spokesperson said: "The Duke and Duchess understand the particular public role that Prince George will one day inherit but while he is young, he must be permitted to lead as ordinary a life as possible.

"No parent would tolerate the suspicion of someone pursuing and harassing their child and carer whilst their child is playing in a public park or going about their daily activities."

Lawyers for Tanna have insisted their client has not done anything wrong and the harassment accusations are "wholly without foundation".

In a seven page letter, Tanna's lawyers said he was "fully entitled" to photograph Prince George in a public place and will "vigorously contest" any legal action.

It adds: "He will continue to undertake his work with the concerns of the Prince's parents very much in mind."

The legal threat is the latest in a long-running battle between the press and the royal family.

The Duchess of Cambridge previously took action after topless photographs of her taken from a public road with a long-lens camera were published in the French version of Closer magazine.