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The Educational Psychology section of this information sheet gives you an overview of what kind of work experience is relevant and which organisations might support it:
https://www.york.ac.uk/media/studenthome/workandvolunteering/infosheets/workexperience/Psychology-work-experience.pdfstudents/work-volunteering-careers/ideas/sectors/psychology-careers/
You might also find the following job sector pages useful:
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