Melt the white chocolate and spread over the base of the tin. Put to one side – or into the fridge – to set.
Mix together the condensed milk (half a regular sized can – you’ll use the rest for the caramel!), vanilla, coconut and icing sugar until well combined. Then spread over the chocolate base.
Combine the rest of the condensed milk with the butter, sugar and golden syrup in a small saucepan. Place over a gentle heat and stir frequently until melted and thickened. It should be a light golden color.
Spread the caramel over the coconut base and sprinkle with toasted coconut.