The £35,000 Banksy (with Tipp-Ex marks)

One of Banksy's earliest commercial artworks - complete with Tipp-Ex amendments - is to go on show in one of the largest exhibitions of his art yet seen.

The original drawing was made for the band Onecut in Banksy's native Bristol in 1999/2000. It pre-dates album covers he produced for Blur and other bands.

But time pressures meant the graffiti artist did not follow his usual method of producing a stencil. His original workings on paper include the use of felt tips and correction fluid.

The image, Underground Terror Tactics, goes on display at the Andipa Gallery in Walton Street, Knightsbridge, from Friday to 29 March. Its price tag is £35,000.

Gallery director Acoris Andipa said: "It is believed to be one of Banksy's first commercial works."

His previous projects for Onecut included a stencil that caused a scandal when it was sprayed on the wall of a sex clinic.

Some 60 works can be seen at the exhibition, all tracked down from private owners - many in Bristol.

Titles include Paranoid Pictures, Roadwork Rat and Precision Bombing.

Prices range from £7,500 to £300,000 - higher than the current £288,000 auction record for a Banksy.