The candidates are enjoying a well-deserved day of rest and relaxation when the peace is shattered by the shrill ring of the house phone. With only 20 minutes to get ready, it's off with their comfy casuals and into their business suits. Lord Sugar wants to meet them at the View on the 69th floor of the Shard.

Surrounded by panoramic views of the sunset, Lord Sugar reveals that he is sending the candidates out to work the night shift. They have to stay awake, find nine items, negotiate the best possible price and be back at the Shard by 6.00am. The team that spends the least amount of money will win the task.

One team quickly zooms off into the darkening streets of London, confident they will be finished quickly and home for an early night. But the other struggles to get off the starting block as one candidate is too distracted by the impressive views to be helpful.

As the evening draws on, the teams battle with closing times and tired shop owners. Negotiations hit rock bottom when the only discount one team manage is 35 pence off a single item. When language barriers send one team on a wild goose chase it's a mad dash back in time for sunrise.

Dawn breaks and it's a bleary eyed boardroom. But there are no excuses accepted for unlucky candidates who face Lord Sugar's firing line.

The candidates are summoned to the National Portrait Gallery, where Lord Sugar instructs them to organise an exclusive late-night event at two of London's biggest tourist attractions - the London Aquarium and Madame Tussauds. In under 36 hours, each team must organise and host an event to remember, keeping an eye on profits but also pleasing the punters. From setting up refreshments and entertainment to making sure they sell enough tickets to fill their venue, both teams have a challenge on their hands.