Apparently the 50kW units are £0.24@kW
That compares well with the Aldi £0.23kW
Polar is £0.30 or £0.15 on the 50kW chargers with the Polar Plus membership
Instavolt £0.35
Ionity £0.69 but they are 350kW chargers (Alas the Porsche Taycan isn’t on the scheme… yet, to make use of them).