Giant Double Chocolate Sandwich Biscuits

I crave biscuits often and chocolate all the time even more often and on a student budget it is very difficult to find an affordable satisfyingly yummy chocolate biscuit... OK who am I kidding Aldi's dark chocolate digestives and Lidl's bourbon biscuits are perfectly yummy enough to gobble down nine at a time, I just wanted an excuse to create the biggest yummiest chocolate biscuits I could think of after 5 hours of data analysis (a uni assignment, fingers crossed!). I plonked myself down to watch the Great British Sewing Bee with a cup of tea and one of these bad boys within half an hour of taking the dust cover off my stand mixer. Yes I could have plonked myself down sooner had I simply taken the lid off the biscuit tin, but truth be told these homemade biscuits ARE much more satisfying than the aforementioned budget buys - not to mention significantly larger! (ENORMOUS)