Out of reach of regular internet searches is the secretive online world known as the 'dark web' where you can shop for illegal goods, and where customers go by code names.

The dark web is facilitated by a global network of computer users who believe the internet should operate beyond the supervision of law enforcement agencies.

5 live Investigates presenter Adrian Goldberg reports.

You can listen to the full report on 5 live Investigates on Sunday, 5 February at 21:00 GMT on BBC 5 live. Listen again via the 5 live website or by downloading the 5 live Investigates podcast.