Toffee brittle seems quite the decadent treat for me, must be all that sugar and the thought of what it is doing for my teeth but hey, it's fun to make.Use whatever nuts you wish and invest in a candy thermometer, which removes any angst regarding whether it will set
or not. Do pour the toffee quickly on to the tray, which you need to tip as you go so it spreads - otherwise you will have a thick set lump before you know it.
Corn syrup is often used when making sweets and can be found among sugars in specialty food stores and some supermarkets. Light honey and golden syrup can be used as an alternative but the flavour will obviously be altered.