If nothing else the last 20 years should have busted the ideological fallacy that privatising public services is always a good thing. Competition means lower prices for consumers? Not if you're a gas and electricty user or need to take the train, it doesn't. The private sector is more skilled than the state? Tell that to the victims of Railtrack. Services plummet, prices soar, but the taxpayer subsidy continues unabated, hoovering public money into private pockets.
Royal Mail is the biggest but not the only current battlefield. Locally, see Shirley Ford on the de-facto privatisation of the Metro, demanded by the government as a condition of new investment (as if Metronet simply never happened). Peter Mandelson is said to be "beyond angry" at the threat of strike action. In truth, it's those of us who need a reliable post service and affordable public transport that should be incandescent with rage.