Radius PLUS has commenced a development project of its own to develop live access electrofusion access saddles for deployment of stopper systems to PE mains, specifically the smaller diameter type needed for its RTP stopper deployment. Such systems will be available for mains 63mm to 450mm when fully completed, including imperial 3” to 8” sizes. It is proposed that the NIA project run concurrently with that development to accelerate the development through offline deployment testing, review and definition of engineering standards for medium pressure RTP stoppers, preparation of codes of practice/engineering policy documents that all lead to ability to undertaken field trial deployment safely within the network. Three field trial deployments have been included within the scope of the RSL cost elements, the value can clearly be adjusted if further field trial deployments were preferred for the purpose of statistical or practical confidence of the technique in the network.