Judicial Diversity Statistics 2017: 

https://www.judiciary.uk/judicial-diversity-statistics-2017/

https://view.officeapps.live.com/op/view.aspx?src=https%3A%2F%2Fwww.judiciary.uk%2Fwp-content%2Fuploads%2F2017%2F07%2Fjudicial-diversity-statistics-2017-tables.xls&wdOrigin=BROWSELINK
- Data relates to England and Wales only (ie excluding Scotland and Northern Ireland)
- The numbers are for headcount only (rather than FTE)