I've just been in to my local dealer (Lincoln, UK) to see if there's an update yet for the LKA twitch. They checked and said there are no campaigns at the moment. Owners won't automatically be told, we have to keep contacting them periodically to ask. They are reluctant to run any kind of update unless they really have to as it can brick the car and the head unit would then have to be sent away to MG to be reset.
(2023 MG4 SE LR, MPU Ver SWI69-29958-1100R16, MCU Ver 69.3.5.0).
Just out of interest, what am I missing out on if I'm still on R16?