Buckingham Palace said that the Queen was not in the building when the man tried to get in, but would make no further comment.
More top news
Hundreds of hotels in the UK have poor food hygiene ratings, some which need improvement urgently, but are withholding them from the public.
Delivery company Deliveroo insists the majority of its riders are happy, as an ITV News investigation reveals the hardship of life for many.
Bavaria is set to roll out a ban of the full-face veil in a number of public places, including schools and universities.