Why the Bank of England counterfeits money
Counterfeiting is done by the Bank of England to inflate the money supply, debase the currency and make the price of things, especially assets, rise. The euphemism used by the Bank of England to try to give credence to what it is doing is 'quantitative easing'.
The Bank of England purchases government and corporate bonds already in circulation with this counterfeit money, directly injecting it into the financial markets. The counterfeit money not only increases the money supply, but also increases the price of government bonds by artificially adding demand for them. This lowers the cost of borrowing for the government, which in turn lowers the cost of borrowing to speculate in financial markets in general.