The Millennium Cohort Study data is available from the UK Data Service with a standard End User licence, which means your application is authorised directly by the UK Data Service, and you can download the data directly from there.

The following links will take you to the relevant area of the UK Data Service for the Millennium Cohort Study: https://beta.ukdataservice.ac.uk/datacatalogue/series/series?id=2000031

The analyses were based on Sweep 1 and Sweep 4 of the MCS.