A video circulated on Twitter showed protesters yelling abuse at veteran news anchor Jon Snow as he made his way in.
Following the incident in Camden, the Metropolitan Police said: “Officers are responding to a demonstration at a private premises on Gray’s Inn Road, Camden, where people have unlawfully gained access to the building.
“Officers are on scene engaging with building security and removing those who have gained entry.”
The protesters left in the afternoon, a video on social media appeared to show a smaller group of demonstrators issuing a list of demands to the company.
It follows an incident on August 9 when a crowd thought to be made up of anti-vaxx protesters tried to gain access to the BBC’s old headquarters in White City, west London.
The premises is now used to film ITV’s talk show Loose Women.