On 12 September 2015, Watson was elected Deputy Leader of the Labour Party, alongside new leader Jeremy Corbyn, gaining 198,962 votes or 50.7%, including second preference votes from those who voted for other candidates. Following the conviction of Carl Beech in July 2019 for making false allegations of paedophilia, Watson was criticised by high-profile victims and their relatives for his role in the affair. On 6 November 2019, Watson announced that he would be standing down both as an MP and as Deputy Leader, and leave office on 12 December 2019, stating that his reasons for standing down were "personal, not political". He later admitted that he had voted for Owen Smith in the 2016 leadership election. In March 2020, he was appointed chair of UK Music and later that year was made a senior adviser on problem gambling to Flutter Entertainment.