UK Shipping, I didn't Know...

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I really don't get a handling charge for Royal Mail or any DHL expenses, Where does the money go from paying for shipping to the UK? And please forgive me as I don't mean to offend anyone but 20% VAT and another 10% Import Duty and another 12GBP seems preposterous to me. Many, many years ago a small group of protesters made history by dumping 342 chests of tea into a harbor...just saying.