There’s a subsidy for the charge point,as above.
There are also subsidies for the purchase of certain electric vehicles.
These are two separate things.
There are requirements for the grant, one is that the customer either has or has signed a purchase agreemtn to get, a car that is one of the approved vehicles. In this case the customer will not get the grant. This need to be evidenced in the paperwork that goes to the government in order to claim the grant.