Health and safety guidance
[ch 9: page 157]HSE, Managing shift work: health and safety guidance: www.hse.gov.uk/pubns/priced/hsg256.pdf.
General union Unite published revised guidance in October 2013, Shift work and night work — a health and safety issue for Unite members: www.unitetheunion.org/uploaded/documents/ShiftandNightWork%2011-4950.pdf.