“…Consequently, ONS estimates of the number of people who are on a ZHC in their main job focus on Q4 of each year until 2013, after which both Q2 and Q4 estimates are comparable. Other sources of survey data on ZHCs (or NGHCs) with national or near-national coverage include biannual ONS business surveys from 2014-2017 (see ONS, 2018), ad hoc additions to Chartered Institute of Personnel and Development (CIPD) Labour Market Outlook and Employee Outlook surveys in 2013 and 2015 (see CIPD, 2013; CIPD, 2015), the 2018 LSE-CEP Survey of Alternative Work Arrangements (see Datta et al, 2018) and a question in the British Household Panel Survey (BHPS) from wave 9-18 (1999-2008) but not beyond 2008 (see Koumenta and Williams, 2015). There are some limited additional data available for specific sectors and occupations (e.g.…”