This is my mother's recipe - I don't know where she got it from. She only made this a couple of times a year, so it was a special treat. The best bits were always the lumps that were scraped out of the pan after the bulk had been poured out - they have a different texture to the poured toffee. It's not chewy or hard (or even, strictly speaking, "toffee"), but melts in the mouth. A lot of people call it tablet.