About the Authors

Nigel Rees

Roles Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Validation, Visualization, Writing – original draft, Writing – review & editing

nigel.rees5@wales.nhs.uk

Affiliation Welsh Ambulance Services NHS Trust (WAST): Pre Hospital Emergency Research Unit (PERU), Institute of Life Sciences Swansea University Singleton Park, Swansea, Wales, United Kingdom

Jeremy Howitt

Roles Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Supervision, Validation, Visualization, Writing – review & editing

Affiliation Cadair Consulting Ltd, Bristol, United Kingdom

Nigel Breyley

Roles Data curation, Formal analysis, Investigation, Methodology, Project administration, Resources, Software, Validation, Visualization, Writing – review & editing

Affiliation Cyclops Air Cyclops Air Ltd, Lincoln, United Kingdom

Phil Geoghegan

Roles Data curation, Formal analysis, Investigation, Methodology, Project administration, Resources, Software, Validation, Visualization, Writing – review & editing

Affiliation SwiftFlight Avionics Ltd, Altrincham, United Kingdom

Carl Powel

Roles Formal analysis, Investigation, Project administration, Resources, Software, Validation, Visualization, Writing – review & editing

Affiliation Welsh Ambulance Services NHS Trust (WAST): Pre Hospital Emergency Research Unit (PERU), Institute of Life Sciences Swansea University Singleton Park, Swansea, Wales, United Kingdom

Competing Interests

The authors of this paper are not employed by these companies but self-employed consultants working on the project via Cyclops Air Ltd and Cadair Consulting Ltd, respectively. The specific roles of these authors are articulated in the ‘author contributions’ section. This does not alter our adherence to PLOS ONE policies on sharing data and materials.