Mary Lite, Old Duffer,
Sorry to burst your self contained bubble of doom and gloom but the picture you are desperately trying to portray is false. As Asturias56 points out above, trying to equate Government owned national debt to that of an individual or company is mischievous, misleading and wrong. Who is ever going to call in that debt? As most of it is the Government itself it will never happen. Underlying economy is healthy and only the looming train wreck of Brexit threatens it in any way shape or form. And even then, and I speak as a died in the wool remainer, it will knock mere percentage points off GDP over a period, cause massive distress and heartache to ordinary people, but the underlying economy will survive.