The brand of sugar-free confectionary that mum used was a brand called Double'D' and it can be found in Woolworths supermarkets here in Australia. The chocolate she used was also sweetened with stevia, so if you love a sweeter version of chocolate, then I suggest you use stevia-sweetened chocolate as well. Bakers chocolate tends to be easier for people to get, but you can mix it with a sweetener of your choice to yield very similar results.