Smart Meters can be useful for monitoring usage, but households can do this with products from TheOWL. When they work they save you needing to read own meter and submit readings. But still worth reading meter every month as check, or at least when prices change, until sure daily reads being submitted via the DCC sucessfully.
In Home Display energy monitors can be linked to the ZigBee Mesh from Comms Hub usually attached to the Smart Electric meter. You are meant to get one when Smart Meter installed but some report this not the case. Apps from supplier and third parties can be used instead, but they won't be as live, as receive reading indirectly rather than via Local Area Network mesh.
If you have a smart meter and want it removed for any reason, then ask your supplier, they are likely to quote you for this. You will likely need to move to credit meter if on PAYG. BG Energy and SO Energy provide quotes on request. Be wary of changing supplier, as new tariffs often come with a conditions to require a Smart Meter. All to fill targets for the rollout that all suppliers required to set.
You can find others who have managed to get Smart Meters removed on SMART METERS Health Problems UK. Even if EM sensitivity is a nocebo effect, Smarts Meters can affect mental health with many problems caused directly or indirectly by Smart Meters, that affect occupier such privacy and security, with being spyed on, having a remotely cut off switch, false promise.
Don't fall for Sov Citz / Freeman psuedo-legal arguments regarding not needing to have household contract with supplier / shipper, unless off grid. See Sovereign Citizens: Pseudolaw & Disorder by münceat. Instead look up your Suppply Point and consider what it says.
Xoserve explain the structure of the industry
The Network Code and other regulations, agreements and mandates that govern the industry.
The National Grid transports energy to us, is just one part of the infrastructure that delivers energy. Recently, National Gas split from them as a rebrand.