Understanding how the tax and shipping costs for uk were arrived at?

Ive asked the team on several occasions how the 92.80 dollar extra for postage from China to uk, plus import taxes is actually broken down and arrived at?

I already paid 20 dollars postage when i made the order and there are no import taxes from China to the uk, so why asking so much?

I appreciate the shipping start point was changed from Europe to China so some extra money may be due, but 92.80 dollars seems excessive?

Is someone on the team please going to answer me? Im not feeling good about Brax if im just ignored.