Yes, you did figure it out Bonkers
Most of the chargers in Europe are 11kW (16A, 230V, 3phase) where each phase can only supply 3.6 kW or they are 22kW (3 phase 32A per phase)
Much rarer are the fast chargers of 43kW (63 Amps, 3 phase).
It is different in every country though. In the Netherlands the vast majority is of the 3 phase 16A kind (11 kW)
3 phase 32A chargers (22 kW) are far less common (about 1:10) but still you would find at least a few 22kW in every city.
Germany and france are different as most of the chargers there are 22kW chargers (3 phase 32A)
Apparantly the UK uses more single phase 32A stations (7.2 kW) and then it would make more sense to put both 3kW chargers of the SR/F on the same phase 1.
So to recap.
An SR/F premium with charge tank on a 3 phase station would get around 9kW on a 11kW charger and the full 12 kW on a 22kW or 43kW station.
It would get only 3kW on a single phase charger, whether the charger is 3.6 kW or 7.2kW. So it's best to avoid those.
Not so nice if you live in a country that has a lot of single phase chargers