Shipping to USA temporarily suspended.
There was a de minimis threshold of $800 below which import duties were not collected.
From August 29th an additional import charge (7.2% duty plus handling fees) will apply. Royal Mail will be introducing their "Postal Delivery Duties Paid" service for low volume exporters so these extra costs can be born by the shop, not you the customer.
When there is more clarity normal shipping will be resumed (expected by end of week).
More information here: Royal Mail is changing its services to the USA
