I just had two small packages sent to me (personally -- not the museum) from Scotland through regular Royal Mail. Two different packages sent by two different people. I expected both of them in about 6 to 10 days, which I think is a pretty fair average based on past experience. Both of them took longer than three weeks to get here. So I don't know, maybe something is going on either with the Royal Mail or the USPS that is delaying these international deliveries.

Haven't noticed any unusual delay in the shipments we get in for the museum gift shop, yet, but usually there we are talking about larger packages, with different kinds of customs requirements.