Out here in ginger nut diaspora we have to resort to making our own. So here's my recipe (sorry, forgot about it last night).
Yield approx 24.
Sieve together:
4 oz flour,
1/2 level tsp bicarbonate of soda (this is the most important ingredient)
1-2 level tsps of ground ginger
1 level tsp ground cinnamon
2 level tsps caster sugar
Warm 2 oz butter and 3 oz golden syrup until runny, then pour the liquid in and stir it all together. Roll into small balls, put on a greased baking tray, leaving plenty of room between and bake for 15-20 mins. at fairly hot (375°F or190°C)