The objective of the Consumers, Vehicles and Energy Integration project is to inform UK Government and European policy and to help shape energy and automotive industry products, propositions and investment strategies. Additionally, it aims to develop an integrated set of analytical tools that models future market scenarios in order to test the impact of future policy, industry and societal choices.The project is made up of two stages:Stage 1 aims to characterize market and policy frameworks, business propositions, and the integrated vehicle and energy infrastructure system and technologies best suited to enabling a cost-effective UK energy system for low-carbon vehicles, using the amalgamated analytical toolset. Stage 2 aims to fill knowledge gaps and validate assumptions from Stage 1 through scientifically robust research, including real world trials with privatevehicle consumers and case studies with business fleets. A mainstream consumer uptake trial will be carried out to measure attitudes to PiVs after direct experience of them, and consumer charging trials will measure mainstream consumer PiV charging behaviours and responses to managed harging optionsThis report represents Deliverable 1.4: Stage 2 Trial Design, Methodology and Business Case.The purpose of this report is to communicate the proposed design of research activities to be conducted in Stage 2 of the project.There are six parts to this report:Part 1: Overview of Stage 2,Part 2: Consumer Uptake Trial,Part 3: Consumer Charging Trial,Part 4: Fleet Study,Part 5: Analytical Tool,Part 6: Commercial Submission.Part 1 provides an overview of the work package and task structure of work to be completed in Stage 2of the CVEI project, together with the approach to health and safety, to data privacy and security management. In addition, the dissemination strategy is included, describing the approach for maximising the impact of the project outputs.The proposal for Stage 2 reflects collaborative development involving TRL, Baringa, Element Energy, Cenex, EV Connect, EDF, Behavioural Insights (BIT), Shell and the ETI.The detailed rationale and technical design of each element of the work are presented in Parts 2 to 5. Full details of the project timeline and costs were provided as Part 6 of this deliverable (Commercial Submission), but are not included in this document