The need for oxygen supplies is a safety requirement of any hospital, not just endoscopy units. JAG requires services to comply with all NHS England safety and regulation notices. The NHS advises that all oxygen should be piped or the service should have a plan to achieve this. This does not state that portables gases cannot be used and it would be inconceivable that the whole recovery area would be supported by mobile gas cylinders.
The most recent national alert has been issued on the risk of death and severe harm from failure to obtain and continue flow from oxygen cylinders (9 January 2018). This alert asks all organisations to adopt a systematic approach to ensuring all their staff using oxygen cylinders can safely operate them. This needs co-ordinated implementation rather than separate action by individual teams or departments. For hospital trusts, if you are unsure who will co-ordinate implementation of this alert, seek advice from any member of your local medical gases committee.
https://www.england.nhs.uk/publication/failure-to-obtain-and-continue-flow-from-oxygen-cylinders/
Every Hospital will have its own medical gases committee that will have access to a risk assessment of your endoscopy service.