An interesting background to this, which can easily be obscured by the emotive 'If you're not for the HRA you're against human rights' stuff is that English common law is profoundly different to Napoleonic law. Napoleonic law states the rules explicitly, and one rule can only be changed by replacing it with another. English common law is largely created in the courts, as judges set precedents.
Very crudely, the difference is that Napoleonic law forbids things unless they're specifically allowed, whereas common law allows things unless they're specifically forbidden. The UK right to freedom of speech, or the right to strike, can exist under common law without ever needing statutory protection, simply because there is no law forbidding it. Under common law, the description of something in a statute may not necessarily enshrine that right - it may actually circumscribe it by outlining its limitations.
On the other hand, under Napoleonic law there is no right to free speech unless someone passes a law explicitly describing that right.
What we've been seeing in recent years, particularly since the Lisbon Treaty enshrined the ECJ as Europe's supreme court, is a widespread cultural confusion about which way round our laws work. I think this confusion lies at the heart of the cultural malaise that often pops up in small-scale interactions these days. Under common law, with everything permitted unless explicitly forbidden, a mesh of social norms fills in the gaps: you refrain from doing something that inconveniences your neighbour not because they're illegal but because society expects you to refrain. The incursion of a more Napoleonic attitude breeds a greater temptation to say 'I can do this thing that annoys my neighbour, because it's not illegal so you can't stop me.' Then the only way to solve it is to create more and more laws that say what is and isn't illegal - witness the rash of new offences created under NuLab to do exactly this. And in the process people complain of micromanaging, and of people less and less able to rely on common sense and social norms.
I'm not saying this can all be blamed on the conflicts between Napoleonic and common law approaches, but they go some way to illustrating the ways in which these competing systems are changing the culture of this country. To my mind the HRA is a minor part of a much larger picture, and I would prefer to see it scrapped in that light. Not because I think murder or slavery are OK.