Thank you Colin. Mine comes on and stays on until dismissed. I had a good look at the rear seat cushions and floor latches and the only electric cable is to the seat belt sockets so it looks like there is no system to check for seat occupancy, only if belts are fastened. Pity I can’t check on my old Jazz again!
So just like the Connect system warning message, it is another thing to do before driving every time. I will however ask the dealer about this when normal times return.