It's pitch black and we're crawling along a secret underground tunnel beneath a high street in Hull. We pass rotting beams propped up precariously by stacked breeze blocks. A rusty car jack is helping prevent the shop floor above from falling in.
Through the rubble, we follow a Trading Standards Officer, his torch swinging back and forth in the darkness until it rests on a hidden stash of thousands of illegal cigarettes.
This is just one such surreal experience while investigating the sale of illegal cigarettes in Hull. In one week we repeatedly witnessed counterfeit and smuggled tobacco being sold in high street mini marts - and were threatened by shop workers who grabbed our cameras when we tried to film them.
This is now a familiar story being repeated across Britain. In April, the National Crime Agency (NCA) raided hundreds of high street businesses, many suspected of being supplied by international crime gangs. Trading Standards teams have also found a thriving trade in illicit tobacco.

