Two pieces of graffiti painted on the side of a trailer owned by a Norfolk couple have fetched almost £100,000 at an auction in Scotland.Staff at Border Auctions, in Hawick, said the work was believed to have been created by mystery graffiti artist Banksy at various music festivals in the late 1990s.

Two pieces of graffiti painted on the side of a trailer owned by a Norfolk couple have fetched almost £100,000 at an auction in Scotland.

Staff at Border Auctions, in Hawick, said the work was believed to have been created by mystery graffiti artist Banksy at various music festivals in the late 1990s.

One piece called Drums/Grenade fetched £38,000 at Saturday's sale while a second, called Sid Vicious 100% PunkRock, went for £58,000.

The artwork was cut from a 10m wooden trailer owned by Nathan Wellard and Emma Neale, from Northwold near Downham Market, who befriended the then unknown artist as they toured music festivals supplying circus tents.

Banksy, whose real identity has never been revealed, is renowned for painting politically-charged murals on city buildings but auctioneers said the festival-inspired works were a rare find.

An auction house spokesman said: “These early examples of his work are quite different from the more well-known urban, stencil work often created at night.

“The concept of performance art by Banksy is virtually unknown to the media and general public alike and these works are probably some of the first to come to auction.”

Border Auctions' director Maurice Manning said both pieces had been bought by anonymous telephone buyers.

The Times reported earlier this month that Mr Wellard and Ms Neale hoped to make £500,000 from the art on the trailer which includes the larger work Fragile Silence, depicting commandos landing a sound system on a beach.

The couple said he began painting the mural in 1998 in exchange for Glastonbury tickets and added to it at later festivals.