Another requirement for this recipe is liquid glucose. The owner of our local pasticceria very kindly offered to give me the tablespoonful I needed but I wanted to make the recipe with something I knew I could get again, without asking him for a favour. I had read that good old British Golden Syrup is a reasonable substitute and I had some that I had bought in Catania. I am glad to be able to report that it worked!
My slices are not as tidy as "Sweet Miss Hope's" but wow, they were good!