We had to suspend shipping to the USA in August when they slapped an $80 tariff duty on ALL small parcels, which clearly we could not impose on our customers.  It then changed to a blanket 10% tariff on parcels from the UK, plus a per parcel customs handling charge.  It now seems somebody pointed out that books are protected in U.S. law (though for how long…) and will be exempted from tariffs though the customs handling charge remains, albeit payable in the UK.  We are reading up on the rules on the Royal Mail site, and if we think we understand it all, we will reinstate a USA delivery option next week. And then go for a lie down.