The only person who was right about the general election tells us what threw off all the Brexit polls

Polling analyst Matt Singh looks back at how difficult it was to predict the Brexit result after the June 2016 EU referendum.

He also told Business Insider that phone poll response rates have dropped significantly, making it even harder for pollsters to accurately predict results.

Produced by Joe Daunt. Filmed by Claudia Romeo. Special thanks to Lianna Brinded and Adam Payne