I remember them well and I have used those toffee trays as baking trays for years and still have them and at least one wee hammer. Different make nowadays but they are still available, much smaller (of course) and much sweeter because they use that revolting glucose syrup to make it instead of proper sugar. Don't buy them now as they are not as good.
Those were the days of wholesome ingredients and the toffee was really special. 