The November recipe from BBC Good Food required Carnation caramel from a tin. In Norway it is near impossible to find caramel in a tin. I had to make it myself.
One tin of sweetened condensed milk (bought at the immigrant shop at the local mall), a slow cooker, and about 8 hours of submerging the tin in water in the slow cooker on low heat. (You can also do it on the stove in a pot, filled with water.