If you go there after 1 Feb 2019 you need to make an on-line appointment to apply for the visa, if you go before you can walk in to apply between 09:30 and 11:30 and collect your visa the next working day between 14:30 and 16:30. You must have a filled in application form and a checklist, ticked and signed. To be helpful, here is the link to download both forms.
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%20Toursit%20TR_1_0%20application(1).pdf