VAT at 20% plus either £8 if sent 1st class mail or Priority mail or £13.50 if sent express mail or its oversized package.
I order every 2 weeks from USA and its been like that for a while now.
Best to check tracking details, find who has it (likely parcelforce if sent USPS mail) call them give the tracking number (or postcode fr your house if you dont have it) and pay over phhone for next day deliverey, dont pay for saturday delivery (costs an Extra £12) as parcelforce as that busy currently they are trying to clear parcels and WILL deliver on saturday if they have it, I paid customs charges twice on fridays in last 2 weeks and BOTH delivered saturday and I did not elect to pay the charge when they asked!.