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For maybe 90% of UK employees you don't need to file any kind of tax return, your employer handles all that for you.

If you do have some uncomplicated deductions (eg. you are a higher rate tax payer and have made large donations to charity, or have business expenses which were not paid by your employer) you can phone the tax office or ammend them online.

Only those in more complicated situtations need to file anything, which most people do through the tax office's website.