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How does SED (Secure Electronic Delivery) work?
The BL (British Library) will email you a link to your document. It is held on their secure server. The document is available to download and print for 14 days. It can only be downloaded and printed once and will expire after 14 days.
For more information, please check 
Factsheet 105: Document Supply - Inter Library Loans (pdf - 282kb).
Useful web addresses:
http://lis.tees.ac.uk/ill