QE is a temporary move, like a theoretical payday loan.
The Bank of England hasn't actually found that money. It is a way of pretending that it is there (and everyone is going along with the pretence) that the country's assets have a higher value than they did before the quantitative easing, so that in the short term we can spend more than we did before, and others will lend us some, or let us run up a slate, in the belief that we have more than we actually have, and will in the long term be able to pay it back.
If our wonderful leaders handle things right and we get lots of dosh from the world markets which are said to queueing up to buy from us and use our expertise in financial sevices and so on, we will flourish and get back into the black. The imaginary money will be transformed into real.
If they make a cod of it, or the world has enough of their own service industries and the manufactured goods we want to sell them, and don't spend money with us, then the imaginary money will become a minus on our national bank statement and we will be even further in the red.