Preheat the oven to 180℃/160℃fan/Gas 4/350℉. Grease and fully line a 2lb loaf tin or 2 x lb loaf tins with baking paper and a few muffin cases.
Beat the sugar and butter together using an electric whisk until light and fluffy.
Gradually add the eggs and treacle( a little at a time). Fold in the flour, mashed bananas and dates. Mix until everything is combined.
Pour the mixture into the prepared tins. Bake for 50 minutes if using a large tin 2lb tin, or until cooked through. Less time for smaller tins. Insert a skewer or sharp knife in the middle of the loaf, if it comes out clean it's done.
Leave in the tin for 10 minutes, then remove to a wire rack to completely cool.
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Notes
The quantity is enough for a 2 lb loaf tin or 2 x 1lb loaf tins and some muffins.