Pleased to see that www.gov.uk/government/p... gets an outing in Annex 1. Further, outside scope of that report, there's a lot of variation in the time sick between stopping actual work and claim for out of work benefit, depending on SSP and contractual sick pay eligibility.

A study of work and health transitions: analysis of Understanding Society

This research was commissioned to further our understanding of the dynamics of work and health transitions.