Preheat the oven to 170°C, 150°C, gas mark 3. Place the oats, flaked almonds and walnuts on a baking tray and lightly toast for around 5 minutes.
Meanwhile, warm the honey, butter, sugar and cinnamon in a large saucepan, until the butter has melted. Pour in the toasted oat mixture, add the fruit and stir well until everything is combined.
Lightly grease and line a baking tin with baking parchment, then spoon the oat mixture in. Press down firmly with the back of a spoon so the mix is compacted.
Cover loosely with more baking parchment and bake for 20 minutes. Allow to cool in the tin and then cut into 12 bars.