Right so is the official MG one just a sort of short plug with no cable, that would be no good really.
What really we need is something that plugs in with a long cable that you can put through your window garage or whatever as it does rain a lot. You need to be able to plug your three pin UK plug into it in a dry location dont you.
So maybe that website is the best option?
I have just jumped onto the MG site and they appear to changed the design of the original once piece adaptor !.
It DID originally look a little bit like this Hyundai / Kia unit.
But now it is extremely like the EV Cables unit with built in extension lead and a RCD double socket installed.
Strangely enough, it is shown on the ZS EV page, but it does state it is suitable for the MG 4 also, priced at £268.48.
See accessories available for your MG ZS EV, including floor mats, charging cables and spare wheels.
www.mg.co.uk
My guess would be, that these are now being produced for MG by a third party supplier in the UK maybe, looking at the IP65 weather proof socket outlet type used.
These will be produced at a set length I guess .......... ?.
You can choose the length of cable you require on the EV Cables unit.
I just went for a single socket and short cable.
If I need to run power into the house, I will use a suitable extension I already have.
Hope this helps answer your questions