You clearly did not grasp what Kerr said. We run a budget deficit. He said that by not paying the amount we could either cut the size of the budget deficit or spend it. If we spend it we increase the deficit.
That said. You need to offset the gain of not paying them against the losss in tax receipts from companies shifting their operation away from Britain in the event of no deal and the loss in receipts caused by the downturn in the economy.

