Average costing tirz ,years worth

[indolent]

I'm from the UK too and trying to figure out how all this works.
My first thought about ordering something from China is its immediately going to be seized by customs.

It's impractical and inefficient for the authorities to scrutinize every package, so most get through. And truly dangerous or high-value taxable goods are prioritized.

Look for a Chinese vendor which has a free reshipment guarantee in the event of seizure. And build extra time into your plans... two months total between first and possibly second attempt.