QE isn't really new money, at least when talking about asset purchasing (like bonds), it's actually money that's been previously spent into the economy by the state that was meant to be locked away for X years. The government owning its own debt basically means the BoE are paying the government via interest to lock away X amount of money that's been spent in the past for X years. The increase in debt was essentially past government spending being released into the economy, they took things like bonds that locked away past government spending and doesn't show up as debt (bonds are assets) and released that into the economy as money that does show up as debt, the £700bn odd of QE had already been spent into the economy at sometime in the past but the BoE essentially said I'll pay you X amount in interest if you give me £10k for 10 years (<example) so i can temporarily remove that from the system. As for the exact numbers of how much government debt increased I'm not entirely sure TBH as I've looked at the exact figures, technically though the government can't owe itself money, it can't get into debt like you and I as no ones going to come knocking at the door asking for their money back. It can however spend to much or to little and either cause inflation (the value of money falls because there's more supply than demand) or deflation/recession (the value of money goes up because demand outstrips supply).