Pre-heat your oven to 160C Fan/180C/350F/Gas Mark 4 and line a 12" x 9" traybake tin with baking paper
Put the butter, golden syrup and caster sugar into a medium saucepan on a low heat until the sugar has dissolved and everything is melted. Stir it all together
In a bowl measure out the oats, dried strawberries and white chocolate chips, and mix them together
Add the butter and sugar mixture to the bowl of oats and stir it in until all of the oats are fully coated
Pour the mixture into the lined traybake tin and use the back of a spoon or a silicone spatula to smooth it out and make it all an even layer
Bake for 25-30 minutes or until they are golden brown all over, then leave to cool in the tin
Put the white chocolate in a microwave safe bowl. Microwave for 30 seconds, stir, then microwave in 10 second blasts, stirring between each one, until fully melted
Pour the chocolate all over the flapjacks, then sprinkle the freeze dried strawberries over the top. Leave to set fully
Use a sharp knife to slice the flapjacks into squares, (or triangles, or rectangles, whichever shape you prefer!)
Store in an airtight container in a cool place and eat leftovers within 1 week