This document describes the Project CLAIRE RPAS demonstration approach and methodologies, aimed at addressing key issues associated with the routine and safe integration of RPAS into a mixed traffic, non-segregated environment. The partners decided to adopt a challenging yet very realistic approach to air traffic insertion by utilising an unmanned tactical UAV operating within the existing airspace structure and ATM operating procedures. A series of incremental Modelling, Simulation & Synthetic Environment (MS&SE) exercises were conducted with external stakeholders to reduce risks, raise awareness and build knowledge. This was followed by live flights of an unmanned RPAS in non-segregated airspace.