G
It's a 16amp ups connector, you'll be wanting a C19 IEC 320 lead.
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here you are job done for you.
http://www.play.com/PC/PCs/4-/17470071/477634384/MHP-2-5m-UK-Mains-to-C19-Female-Cable-IEC-320-16AMP-Rated-APC-UPS-PDU-Power-Lead/ListingDetails.html?_$ja=tsid%3a11518|cat%3a17470071|prd%3a17470071