EV charger

That’s fine, either add a socket into the existing cable run or wire directly into the existing breaker.

Or use a quality extension lead.

Also consider the granny changer will have a decent length of cable on it already. Mines 5 meters.
 
Can I have the wiring for the new socket added to the same breaker as the existing sockets? I don't think I will be using the other socket while having the granny charger plugged in, but there is a freezer connected 24/7. If it pulls 2-3A would it be ok?
 
Yes, that is acceptable as long as they have a sufficient rating for the breaker.

The breaker will flip if the draw breaches 16A in total.
 
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