Harpenden violinist Izzy Johnston cheering on boyfriend Harry Judd in Strictly Come Dancing final

FANS of Strictly Come Dancing are mad about Harry but no-one will be more supportive of the McFly drummer when he appears in the final on Saturday than his long-time girlfriend Izzy Johnston.

Harpenden girl Izzy shares a home with Harry Judd who is the favourite to lift the Strictly Come Dancing Glitter Ball.

Violinist Izzy, 27, who performs with the all-girl electro-string quartet Escala, is the youngest member of the musical Johnston family who run Musicale in Harpenden.

She has been dating Harry, who is one of three finalists in Strictly Come Dancing, for several years and is a regular in the audience of the BBC show in which he is appearing with professional dance partner Aliona Vilani.

Izzy, who was brought up in Harpenden, met Harry when she was part of the string section for a UK arena tour by McFly. In 2008 she and the three friends she made on the tour formed Escala who reached the finals of Britain’s Got Talent and were signed by Simon Cowell’s company Syco Entertainment.

Izzy is a frequent visitor to Harpenden where, earlier this year, she and her brothers Guy and Magnus, both professional musicians, organised a show at the Public Halls to raise money for the Eyes Alight Appeal for the Brain Injury Rehabilitation Trust where their brother Rupert lives since suffering severe injuries in a road accident.