UK Immigration Law
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If they are Iranian and are living in Iran then they will require a visitor's visa. They will have to apply to the British Embassy in Terhan before they travel. Here is the link containing all the relevant information about making an application for a visitor's visa from Iran:-
Along with all the documents listed in checked.You should write a letter of invitation to them confirming the details of there visit here, when they are to leave, stating that you are able to house them (if you are) and provide details of supporting evidence (eg. bank statements ) showing that they will not require the use of any public funds during the course of their visit
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