Lawyers for Kate Middleton have written to the Press Complaints Committee saying they have “disturbing” footage of the paparazzi harassment of Kate which they will use in the event of any claim.

The video apparently shows incidents that happened outside her home and office, and when she arrived and left nightclubs with and without Prince William.

Paparazzi tactics in the past have included shouting obscene words in an attempt to provoke a reaction from their intended targets.

The letter from Middleton’s lawyers to the PCC states “We have a large amount of very interesting but disturbing film footage of those events… What I should make quite clear is that if there is any further intrusion, then a complaint will be made to you.”

Tim Toulmin, director of the PCC, said the letter was a “final warning” to the paparrazi.