The Economics Observatory is great for easy-to-read summaries of economic research. They have several excellent pieces on productivity, including:
These the UK's pressing productivity issue, highlighting its impact on wage growth and living standards. They identify the critical role of long-term government strategy across sectors like technology, education, housing, and transport in addressing productivity challenges. The pieces explore the importance of investment in innovation, education, and infrastructure, and suggests establishing a Growth and Productivity Institute to ensure consistent policy implementation for improving the UK's economic performance.
I've put together a few pages for students to take notes on. All of the articles are worth a look, but if you want to just set one for your students, 'How can the UK revive its ailing productivity? is probably the best as it pulls together key points form the other articles.