Combine the flour, mixed spice, and butter in a food processor and blitz until it resembles fine breadcrumbs. Stir in the raisins, sugar, eggs, vanilla extract and milk. Peel and core one apple before chopping into small pieces. Add to the mixture, mix until combined and add to the lined loaf tin. Core the remaining apple and cut into thin slices. Dip each slice into the lemon juice, shake off any excess juice and lay on top of the cake mixture. Sprinkle the crumble topping over the cake mixture, just allowing the top of the cake to be visible.