Preheat the oven to gas 3, 160ºC, 325ºF. Line a tin approx 20 x 30cm with nonstick baking paper. Place all the ingredients (except topping) into a large bowl and mix together. Spoon the mixture into tin.
Bake for about 30-35minutes, until golden and springy. Allow to cool in the tin for a few minutes then take out of the tin still in the lining paper.
To make topping: mix the sugar, tea and orange juice in a small bowl together. Spoon this mixture over the cake while it is still warm. Cut into about 12 squares when cool. Store in an air tight container.
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