MG MG6 Owner's Handbook Manual page 106

SEATS AND RESTRAINTS
Rear Seat Backrests 'Latch Secure' Indicators
When returning the seat to the upright position, ensure
that the catches are engaged and that the red strip is not
visible - this confirms that the backrest is secure.
Note: When returning the seat to the upright position,
ensure that the seat belts are not trapped.
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