For your PGCE assignments, the most reliable research sources are peer-reviewed academic journals, official government and educational bodies, and foundational educational theory books. The peer-reviewed academic journals include Educational Resources Information Centre (ERIC), British Education Index (BEI), SAGE Journals, Taylor & Francis Online, and beyond. Moreover, the official government and policy sites include GOV.UK, Ministry of Education (MoE), Knowledge and Human Development Authority (KHDA), and others. You can also use theories, such as the Education Endowment Foundation (EEF), Sutton Trust, and Nuffield Foundation. However, if you are unsure about the sources, then it is suggested to get PGCE assignment writing help UK.