In order to invite your parents, family members or friends to come to the UK to attend your graduation ceremony, you DO NOT need a letter from any part of the University specifically inviting them as you can do this yourself.
Your parents/family/friends need to make a visa application to their nearest British Embassy/High Commission and include the following documents (please note that your immediate family - parents, siblings, grandparents etc) will need to apply for a VAF1B Family Visit Visa and friends and other relatives will need to apply for a VAF1A General Visit Visa. If you are at home with your family, you will all need to apply for a VAF1A General Visit Visa:
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Their passport
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2 passport photographs
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The entry clearance fee in local currency
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Evidence that they have enough money to support themselves whilst in the UK, for example, bank statements, payslips, or a letter from their employer. If you intend to support them financially during their visit then they will need to show evidence from you e.g. your bank statements, to prove that you have enough money.
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A short invitation letter from you, confirming your relationship with them and the reason you are inviting them to come to the UK. If you intend to support them during their trip, or pay for the cost of the trip, then you should state this in your letter. THERE IS A SAMPLE INVITATION LETTER ON THE FOLLOWING WEBSITE: http://www1.aston.ac.uk/current-students/hub/iss/visas/visas-graduation/inside-the-uk-inviting-family/?graduation
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A letter from the University which confirms you are a registered student and when you are expected to graduate. You can request this letter via MAP for collection from the HUB (upper foyer of the Main Building).
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A photocopy of your passport (the photograph page and your current student visa). Do not send your original passport.
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Evidence that they intend to leave the UK at the end of their visit for example, a letter from their employer.