21 is currently some 18,000 units ahead of its closest competitor, Jessie J's debut album Who You Are (Island), the release of which was brought forward after her singles success with Price Tag and Do It Like A Dude.

Should 21 top the charts this Sunday, it would be for a sixth straight week. 21 is also set to top the US albums chart this week, after its staggered release in America.

Someone Like You, the second single to be ...