Assessing climate risk using ensembles: A novel framework for applying and extending open-source climate risk assessment platforms

•We present a novel framework involving the application and extension of the an open-source climate risk assessment tool.•We use the CLIMADA risk assessment software and a Generalised Additive Modelling framework to allowing for a richer quantification of climate model uncertainty.•We apply the framework to an idealised example related to heat-stress and the associated risk of reduced outdoor physical working capacity in the UK.•We use 12 km high resolution ensembles from the UK Climate Projections.