If you are in the UK then the BBC Click series did an episode where Bunnie Huang visited various stores:

http://www.bbc.co.uk/programmes/b07jhs3m

And if you're outside of the UK and are looking for this via other means, it was (re)broadcast on 2016-06-25. Still looking for the other part, but I believe it was broadcast on the 11th (also in June) or a week earlier.

BBC Worldwide: I'd buy (a subscription to?) this series - do you want my money?

I wish I could pay for iplayer as well. I'm guessing it's complicated because of BBC being publicly-funded EDIT and international content licensing issues, but if they're producing the content and they own the IP, I'm not totally sure what the hold-up would be. I'd gladly pay $10-15 a month for an all-access pass to BBC content on streaming.

Somewhat astonishingly, I've only rarely had an issue photographing things in HQB. Some of the worst of the iPhone fakers and some of the folks selling unique designs do ask you not to take pictures, but almost everybody is totally cool with it.

I've got a bunch of low-quality pictures of the markets I've been meaning to push up to Flickr. I just need to go through and weed out the stuff that's horribly out of focus.

The one thing I've never gotten good pictures of is a pretty common sight on a Sunday afternoon: A couple of guys hanging out at their shop stall kitting out "iPhone6" boxes with new phones, earbuds, manuals, etc.

Having been to the markets myself, I'd say that they're not "no photos" places. The people in them are very camera shy and will typically insist you not capture any identifiable information like the store's name or number, but other than that pictures are fair game.

Wired did a 1-hour feature recently called 'Shenzhen: The Silicon Valley of Hardware' [1]. They also visit the markets.

[1]: https://www.youtube.com/watch?v=SGJ5cZnoodY

I did four floors of SEG with a 360 video camera: https://youtu.be/DIwvGxjEKaE?list=PLzGeUG3dR0tKtO0KVkANv4D2V...