A commando socket for EV purposes require
1- Commando sockets should not be unshuttered, where domestic installations are concerned. There for it must be at least an interlocked type.
2- Either have PEN protection or be on a TT (earth rod) rather than TNCS / PME earth privided by the DNO.
So the simples’t and cheapest method would be to bang an earth rod in the ground to supply the Commando socket, with its own means of earthing.
3- Should have its “own” double pole RCD protection and be of at least Type A RCD with DC protection
I would not fit a commando unit, unless the customer agreed to these. Of course your electrician may think different, but the regs surrounding commando sockets in domestic properties are many and are a grey area.
The regs now require PEN fault detection built into EV chargers, rather than not so long ago earth rods were allowed. However if you came across a charger without PEN detection and your sparky was prepared to bang an earth rod in and you both agreed it was installed sometime ago, then a common sense approch may be the way to go. Would I do it, it depends!
That said, there is not an awfull lot of difference between chargers at the end of the day, they all have the relevant protection. There won’t be alot of £ difference at the end of the day, when you take in 2 & 3 above along with the fact, you would need to buy a Type 2 to commando cable, to be able to charge.
Ebay item # 285512289823 £199 & 296130905583 £249