Banksy and Shepard Fairey line the walls at Bonhams' 'Urban Art' event

Here's a reminder that several works by the renowned graffiti artist Banksy are to be sold at Bonhams, New Bond Street, as part of its Urban Art sale on September 21.

Leading the way is a work featuring one of Banksy's most iconic images, the monkey, entitled Monkey Detonator. It has attracted a pre-sale estimate of £70,000-90,000.

Executed in 2000, this canvas displays the typically dark sense of humour which has endeared Banksy to both art collectors and the general public.

Also among the sale's highlights is Chinese Soldier by American contemporary artist and graphic designer, Shepard Fairey, best-known for his iconic Barack Obama Change poster in support of Obama's 2008 presidential campaign.

Banksy's Monkey Detonator

Chinese Soldier is one of only seven hand painted works produced by the artist, and has attracted a pre-sale estimate of £20,000-30,000.

Fairey has recently featured in the first major US museum exhibition of the history of graffiti and street art at The Museum of Contemporary Art (MOCA), Los Angeles.

Meanwhile, two more exciting editions to Bonhams' urban artworks for sale are Boxer No 3 (Mad Jock) and Blue Boyby Joe Rush.

Rush is a British artist best-known for his works using salvaged junk and industrial parts. Both works have attracted pre-sale estimates of £2,500-3,000.