Tom Watson, the Labour backbencher and former minister who led the campaign for a further investigation into phone-hacking speaks to the Guardian about the importance of holding the Murdochs to account:
"There is not going to be a killer blow on Tuesday. Expectations are way too high. We will get the symbolism of parliament holding these people to account for the first time. We will look for facts, and not just offer rhetoric.
"This story has been like slicing a cucumber; you just get a little bit closer to the truth each time."