Preheat oven to 180ºC. Grease a loaf tin with baking spray; you may prefer to also line the inside with baking paper if it is a very square sided loaf tin like the ones I use.
In a large mixing bowl, add brown sugar, granulated sugar, honey, treacle, vanilla, melted butter, egg, and Guinness Stout or milk. Mix until even making sure there is no sugar at the bottom of the bowl.
In a second bowl combine flour, sieved baking powder, nutmeg, cinnamon, allspice and salt. Stir to mix evenly. Add the dried fruit.
Combine wet and dry ingredients and mix until you have a thoroughly even batter.
Pour mixture into the prepared loaf tin, add cherries on top if desired. Bake for about 60-75 minutes. Test with a tooth pick or bbq stick.
Let it cool thoroughly before slicing. Wrap in foil to keep fresh