It’s possible to buy a Smart Meter on the open market, @no2sm . There’s also no reason why you couldn’t ask a qualified electrician and Gas-Safe registered engineer to fit them in series with your existing non-Smart meter.
However, the only data you’ll get is from their inbuilt displays.
The data available to your chosen UK energy supplier is sent to them via the Wide Area Network operated either by Telefonica or Arqiva (depending on where you live). That data is sent to the Data Communications Company, a government wholly-owned company. The data is always encrypted, as are the Smart Meter commands.
Your Energy Supplier can request DCC to send commands to meters owned by their customers, and to retrieve data from them. But there is an encrypted pathway through which those requests are sent.
At your end of the system, it is the Communications Hub which handles the encryption system. This bolts on top of the electricity meter. The Comms Hub also operates as a ‘gas proxy’, handling commands and data on behalf of your gas meter. That’s due to power-saving measures within the Smart Gas Meters which allow them to awake once every half-hour to communicate with the Comms Hub.
So in short, I can see no benefit with having your own Smart Meters installed.
But feel free to re-clarify what you want to achieve, and I’ll re-assess my answer!