I'm guessing it must have a radar mounted behind the front grille.
That's how all ACC systems work, whilst a camera behind the windscreen would work the lane keep assist.
Having had semi autonomous functionality on my other car a Genesis Electrified G80 for getting on for two years, I find myself using the feature wherever possible as it takes a lot of the effort out of driving. Whilst the Genesis has what would be described as level 2.5 autonomy, so it includes auto lane change, and various self learning and navigation related features, which means on a motorway for example it has the ability to auto adjust according to posted speed limits as well as adjusting its position in a lane according to traffic around d the car, the system in the MG is more basic but still meets level 2, so this means it will still offer self steer and auto speed adjustment including stop/start in traffic. In fact the MG will self steer around sharper bends than my other car.
So as I said at the beginning of my 'long paragraph' I find I use the system in the MG as much as possible.
However I would mention the MG system is quite prone to 'phantom braking' thinking sometimes that you're going to drive into a car parked by the road.
