The Queen is said to have been hit by a security breach after a stalker was found just metres away from Windsor Castle.
According to The Sun, the intruder posed as priest and a friend of the padre to the Coldstream Guards where soldiers allowed him in to Victoria Barracks despite not having shown any ID.
The Barracks is located just 250 metres from Windsor Castle with a source close to the Royal Family reportedly telling The Sun it was an "extraordinary breach of security."