A cinema in London reacted to the biggest screw-up in Oscars history by 'mistakenly' showing La La Land in a screening of Moonlight.

Staff at the Rio in Dalston eyed an opportunity following the blunder which saw La La Land incorrectly named as Best Picture by Faye Dunaway and Warren Beatty in place of actual winner Moonlight, and craftily played 20 seconds of Damien Chazelle's musical in place of Barry Jenkins' acclaimed drama.

“It wasn’t the actual feature film, but a few seconds from a teaser trailer,’ the Rio's duty manager told Time Out. ”Then we shut it down, and did a bit of fumbling to make it look like we made a mistake.“

Oscars 2017: Watch the La La Land-Moonlight Best Picture error in full

The assembled audience reportedly burst into applause and laughter as soon as they realised what the community cinema was up to

Accountants PricewaterhouseCooper have taken full responsibility for the blunder after Brian Cullinan handed the wrong envelope to the Bonnie and Clyde stars. Beatty has urged Academy President Cheryl Boone Isaacs to fully clarify what happened "as soon as possible."