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COVID-19 was declared a global pandemic in March 2020. To prevent transmission of the SARS-CoV-2 virus on 23rd March 2020 the UK government issued guidance that all citizens should stay at home, and only leave their house for essential medical care, shopping for food and medicine and for one period of exercise (National Health Service, 2020). The impact of following the guidance on health-related behaviours is largely unknown. With people spending large periods of time indoors, screen time (eg watching TV, using computers, tablets etc) is likely to increase. Excessive screen time use has been shown to be associated with a range of negative mental health outcomes (Allen et al., 2019; Huang et al., 2020; Teychenne et al., 2015).