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Preheat the oven to 160C/320f, then place all the nuts on a tray and into the oven for 5 minutes just to toast them a little. Take them out and let them cool.
Add to a bowl along with the flour, baking powder, salt, white and brown sugar and stir together. Blend together the eggs and olive oil then add half the heather flowers and half the orange zest and stir together. Add the dry to the wet ingredients and mix until well combined - it will be a sticky dough. Let it sit in the bowl for about 10 minutes, this helps to make it more manageable to shape.
Line a baking tray with parchment paper. Wet your hands (or the mix will stick to your hands!). Roll the dough into logs, each approximately 25cm long. Place on the lined baking tray and sprinkle with remaining heather flowers and orange zest. Put it in the oven for about 20 minutes until golden brown.
Remove from the oven and allow to cool, then turn the oven down to 150C/300f. After 10 minutes of cooling, slice on the diagonal into 12mm slices Return the tray to the oven and bake for another five minutes, turn over and continue to bake for another five minutes until golden-brown. Place them on a wire rack to cool and then keep them in an airtight Kilner jar.