Ah yes, the "maxing out the country's credit card" argument. The national debt is owed in £'s, which the government can create and destroy at will, and much of it is one arm of the government owing another arm of the government. It's nothing like personal debt.
Yes of course, the UK could simply print enough money to repay all its debts and that wouldn’t have any harmful or damaging effects on its economy whatsoever…