Chris Martin in surprise solo performance

Chris Martin played a surprise solo performance at a gig for Mencap.

The Coldplay frontman surprised the audience at London's Union Chapel by performing cover versions of the Killers track 'When You Were Young' and Bob Dylan's 'Buckets of Rain'.

The pop star also played a new Coldplay songs called 'Bucket for a Crown'.

According to Gigwise, speaking of the new song, Martin remarked "If it's shit, we'll give it to the Killers, if it's good we'll keep it."

The night also saw sets from Lily Allen, The Automatic and James Morrison.