Place the mixed dried fruits, cranberries, glace cherries, chopped almonds, alcohol, butter, brown sugar, treacle, milk, vinegar and orange zest in a large saucepan. Heat gently, stirring often, until the butter has melted then bring to the boil. Boil for about 30 seconds then remove from the heat and set aside to cool until just warm, about 1 hour.
While the mixture is cooling, preheat the oven to 150°C/130°C fan/300°F/gas mark 2. Grease a deep 15 cm/6 inch round cake tin and line it with a double layer of baking parchment.
Stir the mixed spice, cinnamon, baking powder, bicarbonate of soda and ground almonds into the fruit mixture, followed by the flour. It should be a thick batter with no dry patches.
Scrape the batter into the prepared tin and use a spatula to spread it level. Because it is so thick it doesn't spread much in the oven so it is important that you get it as even as you can.
Optionally, arrange circles of blanched almonds and halved glace cherries on top of the cake and press them lightly into the batter.
Bake the cake for about 1 ½ hours, until a skewer inserted into the centre comes out clean.
Allow the cake to cool for 30 minutes then brush with 1 Tablespoon of your preferred alcohol. Leave to cool in the tin completely (about 8 hours).
Once the cake is completely cold, remove it from the tin and brush all over with a little alcohol.
Wrap the cake up in baking parchment then tin foil (it MUST be completely cold first), and store in an airtight container, feeding every week or two with alcohol, for up to three months.