JAG do not mandate the skill mix and number of staff that they would expect to see in an endoscopy service. This is in recognition that the environments in which endoscopy is undertaken varies widely, as do the complexity of procedures undertaken and the acuity of patients seen. These factors alone alter staffing requirements.
The BSG guidance (Dunkley et al, 2017) on safe staffing of endoscopy units is the recommended guidance to be considered when reviewing staffing levels. This document does not mandate staffing levels but focuses on the importance of competency of individuals when considering numbers and skill mix.
You may also find this FAQ helpful:
Dunkley I et al (2017) UK consensus on non medical staffing required to deliver safe quality assured care for adult patients undergoing gastrointestinal endoscopy. https://www.bsg.org.uk/resource/uk-consensus-on-non-medical-staffing-required-to-deliver-safe--quality-assured-care-for-adult-patients-undergoing-gastrointestinal-endoscopy.html