Separate meter install for EV charger?

[Paisley9]

I am looking to install an EV home charger for one vehicle, but possibly two in the future.
I have a second unused (but still active) mains supply cable from a time when we had electric heaters. Unfortunately the separate meter on this supply was removed a few years back. It would seem to be sensible to connect a new meter to this line for the EV, but it is proving difficult to get through to the correct Scottish Power division. My questions are, has anyone done this successfully and if so, who did they speak to??

 

[littlespark]

One property doesn’t usually have a separate supply cable/head/fuse for storage heating…
Normally just taken off the main supply, through a time clock/ radio teleswitch into a separate consumer unit just for the heaters.

Can you photograph your incoming arrangement to show us what you mean?

 

[Paisley9]

One property doesn’t usually have a separate supply cable/head/fuse for storage heating…
Normally just taken off the main supply, through a time clock/ radio teleswitch into a separate consumer unit just for the heaters.

Can you photograph your incoming arrangement to show us what you mean?

Sure. It wasn’t storage heating, but instant heating using oil-filled radiators. Red arrow shows other cable. It did have one of the old style meters attached.