Royal mail have this on their website
Might not be lost afterall?
North America (USA & Canada)
Start date: 1st February 2011
End date: 15th February 2011
The disruption to postal operations caused by adverse weather conditions has ended, and normal operations have resumed.
Start date: 18th November 2010
End date: Ongoing
Update 15th February 2011:
The United States Department of Homeland Security is continuing to require increased security measures for items carried on passenger airlines. As a result, some mail entering the USfrom around the world, and including the UK, that would normally be sent via passenger aircraft must now travel by other means, including ships and cargo planes.
Most items, including personal letters and cards, magazines, CDs, DVDs and lightweight packets, will be delivered in the USwithin a few days of posting. However, there are delays of about two weeks for some heavier packets. These delays are currently affecting stamped items, franked items, and items posted under contract, with the exception of Destination Sort and/or M-Bag items.
Royal Mail is very sorry for these unavoidable delays. We have implemented a number of contingency plans to ensure as much of our customers’ mail reaches the USas quickly as possible and are continuing to work to minimise disruption to our customers, whilst ensuring we comply fully with the USdirectives and regulations.