MPs will leave the Commons for almost three weeks today despite the looming international crisis in Ukraine, provoking warnings Parliament could be "left behind".
At around 7pm, Leader of the Lords, Lord Hill, will read a message from the Queen, sparking a constitutional procedure involving tricorn hats and Norman French, proroguing Parliament until the State Opening on June 4.
The event will close Parliament and unlike a normal recess, recalling MPs in the event of an emergency is very difficult and would require a Royal Warrant.
Labour MP John Mann said there were many subjects which could be discussed to fill the time - and warned MPs could very well need to be brought back to Westminster to debate Ukraine.
He said: "It's a volatile situation (in Ukraine). We don't want to be left behind."