Single payer healthcare in Spain:

The sign on the wall tells the story. "Important information. The government of Valencia owe this pharmacy for all the medicine we have dispensed to you in January, February, March, April and May".

And not just this pharmacy. The government of Valencia - which runs the health system - owes a grand total of half a billion euros to the region's pharmacies.

Paula guides me into that back room that exists in all pharmacies, where the prescription drugs are kept. The problem is, now, there are not many drugs left.

"Look, this drawer is usually full," she says, pointing to where the suppositories are kept. Now there are only two packets."

She opens the fridge. "Look," she says, "we are down to our last packs of insulin. We just have no money to buy the stock."