AMR) Research, Development & Demonstration ( RD&D) Demonstration programme, building on our commitment for an AMR demonstration by the early 2030s at the latest, to prove the potential of the technology. This research paper from the Nuclear Innovation & Research Office ( NIRO) presents an assessment of the most promising AMR reactor technologies to identify the preferred choice of technology that could support UK objectives of meeting net zero climate change targets by 2050. The analysis indicates that high temperature gas reactors (HTGRs) are the preferred technology, with respect to the key objective of demonstrating the ability to generate high-temperature heat which could be used for: