The McFly drummer is 'really annoyed' after discovering he has an ectopic heartbeat - which is also known as a 'wandering pacemaker' and means the rhythm of his heart has missing or extra beats - following his intense training sessions for next month's London Marathon.

In a series of posts on Twitter, the 27-year-old wrote:

We're glad you're not too upset by it Harry but for the love of all things beautiful, please don't go dying on us. That would be a waste of perfectly good 'talent'. And work on your autocorrect while your at it.

As well as the marathon, Harry is also due to tackle a 13-mile assault course in two weeks to raise money for the Teenage Cancer Trust and the Eyes Light Appeal - in aid of The Brain Injury Rehabilitation Trust (BIRT) - which was set up by his wife Izzy Judd and her family after her brother Robert was badly injured in a road accident in 1997.