Just a reminder that when you order your Christmas gifts from the Great Walmart in the Sky, you're pumping money into a series of warehouses that overwork and underpay workers around the world. BBC reporter Adam Littler went undercover as one of Amazon's warehouse "pickers" to see what it's like on the other side of the Amazon transaction:

A handset told him what to collect and put on his trolley. It allotted him a set number of seconds to find each product and counted down. If he made a mistake the scanner beeped.

"We are machines, we are robots, we plug our scanner in, we're holding it, but we might as well be plugging it into ourselves", he said.

"We don't think for ourselves, maybe they don't trust us to think for ourselves as human beings, I don't know."

Prof [Michael] Marmot, one of Britain's leading experts on stress at work, said the working conditions at the warehouse are "all the bad stuff at once".

In response, Amazon says warehouse conditions "comply with all relevant legal requirements." Because they're empathetic like that.