I recently cashed in some Cathay Pacific air miles, soon to expire and not very likely to use them on flights. My wife ordered a fit watch, UK retail about £90, me some fancy headphones UK retail about £110. Not the sort of thing we would normally buy but hey, free. Both sent from Hong Kong and delivered via the Post Office. They asked for email address as part of the process and clearly said import duty is a matter for the recipient.
3 weeks later hers arrived unheralded and with no complication or cost.
I got an email about mine, from Post Office acting as 'import agent' saying duty was due and had to be paid before they would deliver it. Process was painless, online reference number paid by card. Roughly £10 duty and £8 handling fee total £18. Arrived just 2 days after I paid up so swift.
No idea why we were charged for one not the other, both similar in that they were electronics, or how that £10 was worked out. That's what it was.
Royal Mail have info here:
https://www.royalmail.com/sites/default ... n-2017.pdf
HMRC here:
https://www.gov.uk/government/publicati ... e-uk-or-eu
Looking at the HMRC guidance, you could probably 'guess' the VAT reasonably well, but for customs duty if its over £135 - no idea but I expect you can find it somewhere on the HMRC pages. The £8 is a flat fee.
Value Added Tax (VAT) – Import VAT is charged at the same rate that applies to similar goods sold in the UK and applies to commercial goods over £15 in value, and on gifts that are over £39 in value.
The amount of Customs Duty charged will depend on the type of goods imported and the value stated on the customs declaration CN22/CN23 (converted to pound sterling using the rates of exchange for the month of importation as shown on the HMRC website).
The percentage varies depending on the type of goods and their country of origin. Duty is charged on:
the price paid for the goods, plus
any local sales taxes, plus
postage, packing and insurance