The work carried out in this report was funded by the Low Pay Commission. We would like to thank Mary Mosse, Frank Walsh and all individuals within the Commission who provided assistance during the project and provided us with valuable comments on earlier drafts of the report. We would also like to thank the Central Statistics Office for access to the data used in the study.This report has been accepted for publication by the Institute, which does not itself take institutional policy positions. All ESRI Research Series reports are peer reviewed prior to publication. The authors are solely responsible for the content and the views expressed.