Ensure butter and eggs are at room temperature for better mixing and texture., Unsalted butter preferred; baking spread can be used as a substitute., Light brown soft sugar gives best flavor and color; caster sugar or other sugars may alter taste and color., Combination of plain and wholemeal flours adds texture and flavor; all plain flour can be used if desired., Mixed spice is a British blend including cinnamon, coriander seed, nutmeg, clove, pimento, and ground ginger; substitute with pumpkin spice or cinnamon and nutmeg if unavailable., Pecans can be substituted with walnuts or omitted if preferred., For gluten-free option, replace flours with gluten-free plain flour blend and add 1/4 tsp xanthan gum for binding., For dairy-free option, use dairy-free baking block and dairy-free white chocolate., Dough can be frozen and baked directly from frozen later., Immediately after baking, for perfectly round cookies, gently press the cookies into shape with a cookie cutter or glass while warm.