Recall that spices are for turning bad food good.
Note the distinct lack of spices common among British food.
It therefore follows that since British food is passably good to eat, then it must be such that British food is better than all food that uses spices.
Moreover, consider that all non-British food uses spices; ergo, for any non-British food, any British food must be better.
British food is the best food.
Qvod est Demonstratvm