Caveat emptor was the first thought that came to mind if this situation is of such importance to a buyer. Everyone should do their homework on all aspects of a purchase before going ahead with it. The idiosyncrasies of the MG infotainment/driver assist settings on MGs, including those of the MGS5, have been well discussed on this forum. And user manuals are available from the manufacturer/dealers' websites. So there can be no excuse for not doing the homework.
And as @Ian Key has let be known above, them's the NCAP rules as of 2025-2026:
AI Overview
[The] 2025 and 2026 Euro NCAP rules, in conjunction with European General Safety Regulation 2 (GSR2) laws, mean that many advanced driver assistance systems (ADAS)
must reset to their default "ON" state every time you restart the car.
This means that if you turn off lane-keeping assist, speed limit warnings, or driver drowsiness monitoring during a trip, they will automatically reactivate the next time the ignition is cycled.
Key Details Regarding 2025-2026 Rules:
- Mandatory "Default On": Systems like Intelligent Speed Assistance (ISA), Emergency Lane Keeping (ELK), and Driver Drowsiness & Attention Warning (DDAW) must be active by default at the start of every journey.
- Difficulty to Disable: The 2026 protocols require that these safety systems cannot be deactivated with a single button press; they must require at least two steps (e.g., a menu navigation or multiple actions).
- Physical Control Requirements: To counteract the annoyance of hidden settings, Euro NCAP’s 2026 rules (effective Jan 2026) are pushing manufacturers to bring back physical buttons for key functions, ensuring that if you need to turn off a system, it is not buried deep within a touchscreen menu.
- Speed Assist Real-World Accuracy: From 2026, ISA systems will be tested in real-world driving (not just test tracks) to ensure they actually read speed limits accurately, rather than just acting as a "bossy" annoyance.
Why This Is Happening
These rules are driven by GSR2 (General Safety Regulation 2), which became fully mandatory for all new car registrations in Europe (and widely followed in the UK) in July 2024. Euro NCAP is enforcing this with strict 5-star rating requirements for 2026 to ensure these systems remain effective. While some drivers find it annoying, manufacturers are finding ways to make the required "re-disabling" process faster using shortcuts.
So, to get around this, MG have enabled a shortcut to get around having to reset to personal preferences. Users just have to remember to use it.