Non of those solutions would work for myself or anyone using a government rented property (council house).
The main point is you cannot touch any of the electrical systems, not even to put a CT round them. Anything you do will be classed as tampering and you will be fined.
The point is to replace the meters in a way that lets you see the data it stores in a friendly way and to help you understand volts, amps, kWh etc...