In a large bowl whisk the sugar and oil for a few mins until smooth. Mix in the squash, 1 ½tsp of the Vanilla Extract, the seeds and ground almonds. In a separate bowl mix the flour, cinnamon, ginger, Arrowroot, Baking Powder and Bicarbonate of Soda, then fold into the squash mixture. Once almost combined pour in the milk and continue to fold until smooth. Scrape into the tin and bake for 40mins, turn the heat down to 150C, 130C fan, gas 2 and bake for further 2hrs (checking after 1hr 30mins), until springy and cooked through.