This is not the first time security has been breached at the palace.
:: The most serious breach came in March 1982 when Michael Fagan broke into the Queen's bedroom at the palace. She woke to find him sitting on her bed.
:: A year earlier, Marcus Sarjeant, 17, fired six blank shots at the Queen at the Trooping the Colour ceremony.
:: Stephen Goulding was jailed for three months after breaking into palace grounds in 1990. He claimed he was Prince Andrew Windsor and declared the Queen was his "mum".


