Seems to me that Mervyn King & the MPC don't have a clue about what they are doing and don't seem to understand economics.
Now lets see if I understand what they are doing!!! As I understand it they are buying or going to buy billions of Government Gilts off the Banks. Now given interest rates are much lower than the nominal interest rate of the bonds - yields are low and price of gilts high. If the Bank of England keeps the Gilts for the full term they will loose money. Now as yields are already very low there is a limit to how much lower they can go. As we come out of recession the yields should get better which means the price drops. So again if the Bank of England decides to sell them they will again make a loss. So its a no win situation, either they hold them for the full term and make a loss or they sell them some time in the future for a loss. The result is that the Bank of England will be running up a very large debt(loss) in the future. That future maybe 25,30,50 years but a debt loss it will be and a very large one to boot. Seems like they might as well just burn the stuff as I don't think it will make that much difference. Future generations will pay highly for this reckless act