Duffy's single and album are Number One in the UK charts again this week.

Duffy's single and album are Number One in the UK charts again this week.

It's the fourth week at the top for her single 'Mercy', while the singer's 'Rockferry' tops the UK album charts for the second week running.

Leona Lewis' 'Better In Time', released for Sport Relief, only reached Number Two.

Panic At The Disco's comeback single 'Nine In The Afternoon' is a new entry at Number 13, while The Futureheads' 'The Beginning Of The Twist' went in at Number 20.

Elsewhere in the album chart, MGMT's debut 'Oracular Spectacular' is at Number 12, while The Young Knives' second album, 'Superabundance', reached Number 28 in its first week of release.

The UK singles chart Top Ten is:

1 Duffy - 'Mercy'
2 Leona Lewis - 'Better In Time'
3 H Two O ft. Platinum - 'What's It Gonna Be'
4 OneRepublic - 'Stop And Stare'
5 Nickelback - 'Rockstar'
6 Alphabeat - 'Fascination'
7 Flo Rida ft. T-Pain - 'Low'
8 Taio Cruz ft. Luciana - 'Come On Girl'
9 Utah Saints - 'Something Good '08'
10 Basshunter - 'Now You’re Gone'

Via nme.com