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The study page on the UK standard visitor visa page states :
If you’re visiting to do a short piece of research
You must prove that:
- you’re at least 16 years old
- you’re already enrolled on a course overseas that is the equivalent of a UK degree
- you’ve been accepted by a UK higher education institution to take part in research that’s relevant to the course you’re studying overseas
You can visit for up to 6 months to do your research.
Documents you must provide
You’ll need to provide confirmation from your overseas course provider that the research or research tuition is part of, or relevant to, the course you’re doing overseas.