The Official Charts Company said on Friday that British singer Adele's "25" notched up the most sales in its opening week of any UK album, beating a record set in 1997 by Oasis. The 27-year-old's third studio album sold 800,307 copies - compared with Oasis' previous record of 696,000 with "Be Here Now" - and amassed more sales than the last 19 No. 1 albums in Britain combined. The charts company added that it also became the most downloaded No. 1 album ever. Adele, who also broke the single-week U.S. album sales record in just four days with 25, announced on Thursday she would begin a 15-week concert tour of Britain, Ireland and continental Europe in February, her first tour in four years.