I used:
200g butter
250ml honey
150g chopped dates
400g porridge oats
100g of the linseed mix you see in the photo, it contains linseed, chia seeds, goji berries.
The flapjacks work well, I would recommend you leave it to cool for a while before cutting. I made a another batch and used walnuts instead of the linseed mix and it works just as well.
The original Davina recipe:
http://www.redonline.co.uk/food/recipes/davinas-sugar-free-flapjacks