News: huge investment by UK in US Treasury securities

Never mind the conspiracy theorists and the rumoured use of "Caribbean Banking centres" to buy US Treasury bonds; look at this document from the US Treasury, dated 17 July 2007. It shows that in the last 12 months, holdings by foreigners increased by 10.37%, but the UK's holdings shot up over 202% in the same period, from $55.5 billion to $167.6 billion. And the dollar has dropped against the pound at the same time. Can our little island afford such generosity?