Tip the mix into the tin, then lay the peach slices evenly on top – that way each square of cake will have a bite of fruit. Scatter the raspberries and almonds over, then bake for 1 hr-1 hr 10 mins, covering with foil after 40 mins. Test with a skewer: the middle should have just a tiny hint of squidginess, which will firm up once the cake cools. Cool in the tin for 20 mins, then lift out onto a cooling rack. Once cold, dredge with icing sugar, then cut into squares.