From Billboard.com:

Portishead returns with its first studio album in more than 10 years as "Third" bows with 53,000 at No. 7, a new charting high-water mark for the U.K. act. Its last studio effort, 1997's "Portishead," debuted and peaked at No. 21.
 

Hey awesome, congrats! I hope this will encourage the group to release a new album for 2012.