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The UK had to wait 11 years after the contest began to bag its first win.
Sandie Shaw brought home the trophy with a total of 47 points in Vienna, the second highest winner’s score Eurovision had seen at that point.
Puppet on a String's win brought Eurovision hosting duties back to the UK for the first time as reigning champion, although London had already hosted it in 1960 and 1963 on behalf of the Netherlands and France.
The song also became a No.1 hit in the UK, but Shaw, who had already topped the chart with with (There's) Always Something There to Remind Me and Long Live Love, said that she was no fan of Puppet on a String, which was chosen from five potential UK song entries.