According to this
http://www.eurogamer.net/article.php?article_id=60767
and this
http://www.chart-track.co.uk/?i=256&s=1111
My congratulations to Studio Liverpool. I hope the game keeps this pace until Christmas and the total sales make it the most successful WO ever....nine PSP titles figuring in the UK's All Formats Top 10...The top honours went to Namco's Ridge Racer, with Sony's Wipeout Pure at No.3