Prince William and his wife Catherine, Duchess of Cambridge have taken legal action against a photographer over allegations he has been monitoring the daily routine of their young son Prince George.

Lawyers representing the royal couple have sent letters to two freelance snappers, and accused one of the unnamed individuals of following the 15-month-old prince during his walks in a London park with a nanny.

A spokesman for the royals says, "The Duke and Duchess have taken legal steps to ask that an individual ceases harassing and following both Prince George and his nanny as they go about their ordinary daily lives. An incident last week has prompted Their Royal Highnesses to seek reasonable assurances from the individual about his behaviour. The individual was spotted at a central London park in the vicinity of Prince George, who was removed from the park immediately. There is reason to suspect that the individual may been placing Prince George under surveillance and monitoring his daily routines for a period of time...

"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."