I adore Lemon Chicken! Hope you enjoy Robyn :)
Caster sugar is finer than your everyday granulated and so dissolves more quickly which means it's much better for baking.
Packaging weights are usually in metric, kilos, grams, litres etc but some recipes still have both. I have no idea why . . . maybe it's just us Brits who really can't make up our minds. I just wish we would!!!!