//...it certainly shows that the state owned enterprises of this country in the 1970s were not very good but you don’t need to look very far to find ones that are effective//
I've looked quite far and wide and with the honourable exception of the Armed forces, which by and large are second to none despite the efforts of successive governments to reduce them to mediocrity, I'm struggling to find any. I'd add to my list of one the fire & rescue services if the local authorities which run them together with the firefighters' trade union can be persuaded not to destroy the service. Certainly the major services upon which the public rely (police, the NHS, the ambulance service, the DVLA, the Passport Office, the Land Registry, HMRC) are, in the main, completely shambolic.
There are isolated partially successful enterprises set up by local authorities (Robin Hood Energy springs to mind) but in the main these local initiatives in energy and some in construction have proved expensive failures. Why anybody should consider a government or local authority the right organisation to act as an energy provider is a little mysterious.