Bug report: Unable to legally buy postage to the USA for parcels worth more than £593 ($800)
There is a critical bug in the new system for buying PDDP to the USA through click & drop. When declaring a package value of more than £593, the form errors out and fails to submit. The only way to buy postage for a package worth more than this value would be to falsely declare a lower value, which would be fraudulent.
£593 is roughly $800, so I presume this bug is related to the threshold for the previous duty-free limit.

-
Avery commented
The bug has now been updated so that it gives a more informative error message, stating that PDDP is unavailable for shipments valued more than $800. It's helpful that the error message explains the problem, but this doesn't change the fact that it's impossible to legally buy postage for high-value packages to the USA with Royal Mail.
-
Eurwyn Jones commented
The USA is an absolutely enormous customer base, and it's nearly impossible to do business these days without serving them as a majority.
-
EC commented
I have lots of family in America I send things to and would love to be able to continue doing so