Parliament blown up (CYOAH)

At the March 13 House of Lords meeting a German Agent known as Alfred Crowe sneaks in impersonating a member he assassinated the night before and took the roll of.

As Winston Churchill gives an important speech the assassin pulls out a gun shooting some of the members, he then sets off a bomb he had in his briefcase.

The next morning it is discovered that about 85% percent of the members present died. Winston Churchill also died.

What does the remaining government do.