LONDON (Reuters) - Scottish producer and singer Calvin Harris returned to the top of the British album charts with "18 Months" in the first week of 2013, the Official Charts Company said on Sunday. The release, his third studio album, had hit the number one spot on its debut in November, and climbed from seventh place to regain the best sellers' crown. Singer Emeli Sandé slipped one notch to number two with "One Version of Events", while Ed Sheeran jumped to third place from number 13 with his debut album "+", now in its 69th week in the charts. ...