Blend Group 1 together. Add Group 2 and mix to a crumble on slow speed. Do not dough. Filling: Bring Group 3 to the boil and cool before use. Spread 1.8kg (4 1/2lb) crust mixture on baking tray and press down firmly. Spread with date filling. Crumble remainder of crust on top. Press down. Oven temperature 175¡C (350¡F).
The metric recipe is of similar size to the avoirdupois recipe but is not an exact conversion.