The funny thing is, and don't hold this against me, I am a capitalist and I am a tory. Yet, I have never approved of privatisation of such industries. As someone said earlier, gas and electricity are by their very nature monopoly industries. They don't run a separate pipe for each provider.
And also, if we got rid of the utility companies and bought our gas and electric from Transco directly, then surely we would get a better price.
Now imagine if the tories won the next general election, then went and nationalised everything again! I know it won't happen, could you imagine the cost to renationalise industries?