The March 2023 CfM-CEPR survey asked the members of its UK panel to identify the most important constraint on UK potential output in 2023. Most panellists think that Brexit remains the primary drag on the UK’s potential output this year. A small fraction cites poor labour force participation as a major constraint. Several panellists suggest public investments and R&D subsidies as a solution to boost UK GDP in the medium term. Most panellists believe a combination of policies would be the most effective way to achieve this objective.