Durham University have been accused of an attack on free speech this morning, as they introduced last-minute restrictions on anti-monarchy protests ahead of Charles's visit.

At 8.00pm last night anti-monarchy campaigners from Republic were advised by police that they would be able to access Palace Green and protest outside the cathedral. While the university was seeking to contain the protest in the corner of the square, Republic made it clear they had the right to protest where the public were gathering.

By 10.30pm, police informed Republic that Durham University had decided to close Palace Green to the public and refuse entry to protesters.

The protest has been advertised as taking place on Palace Green for several weeks and police were notified in March. No concerns were raised and the police said no restrictions were in place.

The protest is due to take place when Charles visits Durham Cathedral on Thursday morning for the annual Royal Maundy service.

Speaking for Republic, Graham Smith said today:

"Free speech in universities is a hot-button issue right now, so you'd think Durham University would try to avoid accusations of stifling peaceful protest."

"Late last night we learned that the university has blocked all access to the square outside the cathedral, just two hours after confirmation that the square would be open to the public."

"Clearly they have decided they won't tolerate protest against the royals. This is an attack on our free speech, plain and simple."

"Republic has protested peacefully and successfully at the Maundy service in York and Worcester over the last two years. We have protested at numerous royal events, without incident."

"Quite why Durham University thinks the right to protest stops at their gates is something they'll need to explain."

"We will be demonstrating on the nearby street tomorrow, for an elected head of state, an end to the monarchy and for our right to protest."