I don't think you are going to find anything of that quality for much less unless you wait for the sales or 2nd hand/ebay/gumtree.
See if your local carpenter can give you a good cash deal for a custom made unit.
Lots of alternatives if you are willing to spend more though

In approx price order:
Wickes
Argos
Ikea
Homebase
Next
www.jali.co.uk - custom made yours will be about £350!!
Lots Road or other antique auction houses £150 - £5000+
Habitat - approx £400 -800
John Lewis - approx £700 -1200
Heals - approx £800 - 1400
Bo Concept -approx £900-£2000
Singways -approx £1000-£2500
Arca -approx £1200-£2500
Mercantini £1200-3000
Kube Design Ltd -approx £1400-£3500
Presotto Italia approx £1400-£3500
Lema -approx £1700-£3500
Hulsta or Natuzzi -approx £1700-£3500
Capellini -approx £1400-£3500
Ligne Roset -approx £1400-£3500
Conran -approx £1500-£4500
B & B Italia, Porro , Silenia, Spectral Moebal -approx £2100-£5500
Interlubke, Poliform £3000-£7000
Chaplins -approx £1700-£5500
Purves & Purves -approx £1700-£5500
Loft Living £3000-7000
Harrods -approx £2000-£7500
Artanova Athena Sofa!
http://www.coolest-gadgets.com/20090...fa/#more-30667 -£10,000-£12000
Antiques from Sothebys /Christies etc.. £3000 to £2m