Hay J104 Chair
It was designed by Jørgen Bækmark as part of the movement to bring good design to a wider audience. It is now manufactured by Hay as part of their FDB Chairs and Tables family, which has a similar aims of offering excellent design without the extortionate price tag. The chair is available in stained solid beech in black, white, grey or red, or in a natural beech finish. The stained wood chairs cost £168 each with the natural finish version a little cheaper.
Buy them online at Nest.