VAT on anything over 15 GBP
Customs Duty on goods over 135 GBP
Postage, packaging, insurance and duty count towards the VAT
Postage, packaging and insurance count towards duty
And don't forget the Post Office's ransom admin charge.
https://www.gov.uk/goods-sent-from-abroad/tax-and-duty
(I wasn't charged anything when I got one a few months ago).