This raises the side-line question of why chocolate is different in the UK than say here in Canada. We can buy most of the same brands here but they are a lesser quality chocolate. Dairy Milk, Kit Kats etc etc. This is why I have a 400g block of Dairy Milk and another of Whole Nut tucked away from my last trip.
Thorntons now make a very good biscuit - Toffee chip, Orange and Ginger varieties. Superior quality in every way. Available at their shops and at Waitrose.