When I was a child/teen, I used to buy a pack of darkish coloured toffee which was very chocolaty in taste and had a white stripe-like filling in the middle. It was a slab and had to be broken in order to eat it. It took some chewing and lasted ages. It was lovely!
Can anyone remember what that toffee was called? I have just looked on Walkers Toffee website and there's nothing there.