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The UK keeps a list of countries whose citizens will require a visa to transit or visit the UK. So it's all based on nationality.
You did not tell us your nationality so the answer to your question is indeterminate.
What can be done in situations like these is to point you to a web site sponsored by the UK government called Check if you need a UK visa. This site uses the 'wizard pattern' to ask some questions and then make a determination.
Once you have learned if you need a visa or not, you can return here to ask specific questions about the form and evidence.