The private companies will try to make money, which means their services will cost more money. It'll be run similarly to the rail network, which is a complete fiasco, overly expensive and a joke. If you could chose hospitals etc and there was genuine competition it could work but you can't, and not with health. Either the taxpayer would pay more, standards would slip or we'd have to start paying. Privatising necessary public services is not a good idea as they have shareholders who demand to make money so running at a deficit etc is not an option, and they'll pull out if so. Look at Academy schools.