How often do I complain that there isn't enough ginger in a recipe? It's probably more than 50% of the time, with recipes where ginger is supposed to be the main flavor. No such problem with this biscuit recipe from Dan Lepard, which used six teaspoons of ground ginger - the flavour was so fierce there was an afterburn (in a very good way!).
PS - the second attempt at the Spelt, Lemon and Maple Drizzle Cake wasn't any better than the first. I managed to find white spelt flour and added half a teaspoon of bicarbonate of soda to the batter, but the cake still sank, this time even before the cooking time was up. Two attempts is enough - there are plenty of other cake recipes out there!