Anyhow here is the recipe:
3oz Marg - I used marg, but will try butter next time
5oz Granulated Sugar
I can Condensed Milk - my can was 300ml
1 tbsp syrup - I used maple syrup
Melt marg in a heavy based saucepan. Add sugar, condensed milk and syrup. Heat gently, stirring continuously until the sugar has dissolved. Bring slowly to the boil and simmer gently for 20 minutes, stirring all the time. Remove from heat and flavour with a little vanilla essence. Pour into a lightly greased 7 inch tin. Mark into squares when cool.
Okay now what happened with me when I made it. I cooked it for 15 minutes and my poor arm was aching, so figured I do the drop a little bit into some cold water trick, and it was rock solid. So, if I were you I would cook it for 10 minutes, and then drop a little into some cold water to see if it will set up. Mine is okay if you like rock hard toffee that you have to suck to get it to soften up. Now one bonus is, it takes you forever to eat a piece of toffee, but it makes it difficult to talk!!