For an excellent exposition of what changes in the law are being sought and why, see this recent post by Marilyn Stowe.
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UPDATE: Just to prove my point, both this article in the Daily Mail and this post on the CentreRight blog suggest that the intention of these awful reformers is to give cohabitants similar rights to married couples. Do these people say this on purpose to stir up their narrow-minded supporters, or are they just ignorant? (Amusingly, and unsurprisingly, the Tories are rushing to distance themselves from the appalling suggestion that they might cause the breakdown of society as we know it by actually helping people who choose not to marry.)
My thanks to John Hirst of Jailhouselawyer's Blog for bringing these stories to my attention.