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Employment and Support Allowance etc
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Getting a reminder for returning an ESA50 form:
ESA Regulations - Regulation 22
ESA Regulations 2013 - Regulation 18  

How the DWP deals with failure to return an ESA questionnaire or attend a medical examination:
Decision Makers' Guide, Volume 8, Chapter 2, paragraphs 42221 to 42293

DWP Guidance on the changes regarding new claims from 30th March 2015:
Decision Makers' Memo DMG 10/15

The Employment and Support Allowance (Repeat Assessments and Pending Appeal Awards) (Amendment) Regulations 2015