I got the this towbar off ebay,
https://www.ebay.co.uk/itm/146372983081 Automatic Vertical Swan Neck Towbar + 7 Pin Wiring For MG 4 Electric, Xpower ~£200 including electrics.
Very happy with it and nearly invisible. The bumper has no visible cuts which I like a lot. As a bonus you can also re-fit the crash protection as well - so if some-one crashes into you it is much less likely to damage the car structure and write the car off. You can see the plug, it would be possible to hide it completely but that would mean cutting throught a bumper internal support which is probably fine but I did not want to do that. One thing I would say the bolt holes did not line up 100% for me, so I needed to push the 2 plates of the bar apart when fitting, no issues with the clamp type connectors for me (and others here who have used them. )