The site https://www.gov.uk/standard-visitor-visa/overview has information about obtaining a visa for those travelling to the United Kingdom. International registrants should be particularly aware and careful about visa requirements, and should plan travel well in advance.
As part of the visa application process, you may be required to include a visa support letter. To request a visa support letter, you must first register for the conference and then email your request to eurosys16-visas@imperial.ac.uk and include:
Visa support letters are answered in the order they are received. You will receive a PDF letter by email. The PDF serves as a signed electronic version of the original letter which will be mailed to your current mailing address. If you do not receive the letter by post mail on time for your visa appointment, please print out your PDF letter and take it with you.
Please note that a Letter of Invitation will only be sent to participants who have registered and paid for the Conference. Should participants withdraw from the conference after the issue of Letter of Invitation, the consulate will be notified of the withdrawal accordingly.