Hello!
... Let's face it, crash in a Griff and you'd be lucky to walk out of it in one piece whereas in even a modern supermini the amount they can withstand is incredible.
But, the modern supermini has had 10+ more years of development in crash protection over a Griff...
GRP (and other composite) bodies can be just as good if designed that way. Modern F1 cars are a good example

Cheers,