History of Parliament lecture given by Lord Norton of Louth (Philip Norton) "Resisting the Inevitable? The Parliament Act 1911". It was a very informative and interesting speech - which is available on BBC iPlayer at http://www.bbc.co.uk/i/b0170422/.
Can I also recommend taking a look at the History of Parliament website, and at Parliament's webpages with resources on the 1911 Act.
Lord Norton blogs on both the Lords of the Blog and his own personal blog.