Episode 7 follows the most recent full decade of the Christmas number one battles: the 2010s.

The decade saw The X Factor continue where it left off in the 2000s, undeterred by the Rage Against the Machine battle of 2009.

Elsewhere, the 2010s saw the return of the charity record, with five of the 10 number ones raising funds and awareness for various causes.

The decade also saw the arrival of streaming in the charts, leading to a huge surge in Christmas favourites every year.

Full Christmas number ones (look away if you don’t want ‘spoilers’!):

• 2010: Matt Cardle – ‘When We Collide’
• 2011: Military Wives – ‘Wherever You Are’
• 2012: The Justice Collective – ‘He Ain’t Heavy He’s My Brother’
• 2013: Sam Bailey – ‘Skyscraper’
• 2014: Ben Haenow – ‘Something I Need’
• 2015: Lewisham & Greenwich NHS Choir – ‘A Bridge Over You’
• 2016: Clean Bandit, Sean Paul and Anne-Marie – ‘Rockabye’
• 2017: Ed Sheeran – ‘Perfect’
• 2018: LadBaby – ‘We Built This City’
• 2019: LadBaby – ‘I Love Sausage Rolls’