Preheat the oven to 180°C/160°C fan/350°F/gas mark 4. Line a 2 lb loaf tin with baking paper.
Coarsely grate the courgettes then weigh out 350g into a large bowl, do not squeeze it out.
350 g (12 ½ oz) coarsely grated courgette (zucchini) (about 2 medium/large)
Stir in the sugar, oil, vinegar and vanilla extract.
150 g (¾ cup) light brown soft sugar, 110 g (½ cup) neutral oil (I use olive), 2 teaspoons vanilla extract, 1 teaspoon vinegar
Stir in the cinnamon, nutmeg, allspice, baking powder, bicarbonate of soda and salt, followed by the flour, making sure there are no dry lumps.
3 teaspoons ground cinnamon, ½ teaspoon ground nutmeg, ½ teaspoon ground allspice, 2 teaspoons baking powder, ½ teaspoon bicarbonate of soda (baking soda), ¼ teaspoon salt, 300 g (2 ½ cups) plain (all-purpose) flour
Gently fold though the sultanas.
150 g (1 cup) sultanas
Pour the batter into the prepared tin and spread it level. Bake for about 70 minutes until a skewer inserted into the centre comes out clean. Cover loosely with tin foil towards the end of cooking if the top starts to get too dark.
Leave the cake to cool in the tin before slicing.