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Let the filo come to room temperature for about 10 mins before use. Put a baking tray into the oven and heat oven to 200C/180C fan/gas 6.
Brush each large sheet of filo with melted butter, layer on top of each other, then fold in half so you have a smaller rectangle 6 layers thick. If using small sheets just stack on top of each other. Fold in the edges of the pastry base to make a 2cm border, then spread the apricot conserve inside the border. Carefully slide the pastry base on to the hot baking tray and bake for 5 mins.
Remove from oven, arrange apricots over the tart and brush with any leftover melted butter. Bake for another 10 mins, then scatter on raspberries and sprinkle with sugar. Bake for a final 10 mins until the pastry is golden brown and crisp.