About 9 minutes in, Paxman to camera.

"Most people seemed to have accepted that the war had to be fought.
To honour treaties. To defend the empire. To protect Britain.
And, what else were they supposed to do?
To sit back and watch as Germany amassed an empire from Russia to the shores of the English Channel?
Now war had broken out, almost everyone backed it.
Most trade unions suspended strikes, which had been common."