The UK debt is over 900% of GDP

See http://www.businessinsider.com/g10-countries-by-total-debt-to-gdp-2011-12

"This chart is looking at all kinds of debt, not just sovereign debt. The UK's staggering debt-to-GDP ratio is largely due to the size of its financial sector.

All financial sector debt is, to some extent, potentially government debt, since all governments end up having to rescue their financial sectors in the event of a crisis. That's what brought down Iceland and Ireland."

My questions:  How is this even possible?  How much longer can it continue?  When will the UK have its debt crisis?

My answers:  Most of this is "external debt", which is meaningless.  When someone outside the UK, say in Bermuda, deposits money in a London bank, then this is in increase to the external debt.  The bank will then loan money on a skyscraper in Bahrain.  Maybe there is an implicit guarantee by the UK government, but presumably the banks have invested the money and aren't totally bankrupt.  London is an international banking center, that is the only thing this shows.  The only important number is the net public debt, which is debt that the government is actually paying interest on.  And by that measure, the UK is way down the list.