Having driven a Zoe for the last few years my experience is that most public AC Type 2 charging points are untethered. A lot of the Gridserve chargers have a tethered CCS plus a Type 2 socket - watch out for these though as although the unit will say that dual charging is available, if there's someone already on the CCS the Type 2 socket will not start up, but if you're plugged in and someone wants to use the CCS, they are able to start a dual charge - they are also able to quite easily accidentally stop your charge - it's a pretty flawed system.
It's a shame that the MG4s are limited to 7kW or 11kW on Type 2, as 22kW on a Type 2 charger is handy at times, and was the best we could manage with the Zoe.
My leased MG4 SE LR came with both the granny lead and an MG branded Type 2 32 amp single phase cable. My understanding is that privately bought MG4s are only supplied with the granny lead, and the Type 2 cable is listed as a (very expensive) optional accessory. The MG Type 2 cable is a waste of money at £240 given that it's only single phase, and no use to me out and about if it's limited to 3.5kW on a 22kW charging point.