I own a Mercedes-Benz SL and when I needed a car seat for my grandson who is now eight years old, I was told by Mercedes I had to buy a seat to fit that also turned the airbag off automatically. The price for that seat was almost £400. When I asked why it was so expensive I was told it was the cost of the mechanism that turned the airbag off. Car seats, as you know, cannot be sold secondhand, so for what was probably less than twenty trips I had to spend this enormous amount. You state categorically one does not turn an airbag off with a forward facing seat. Was I conned or has the law done a volte-face?