This price is only valid until Monday 19th, when the 15% off offer will stop. After Monday you'd have to pay £304.99 including delivery online - or if you have a 10% off for October card you'd be able to order one in-store for £280.99 including delivery (in-store delivery is £5 dearer than online but you get the 10% off).
I Just received this from B&Q yesterday and it looks great, I actually paid more for it than the current deal, but went back to the store this evening and got them to price match themselves - so got it for its current price of £260.65 including delivery.
The picture online shows this as white but it is in fact graphite which looks great in my kitchen. Also when buying online the 15% off discount is applied automatically near the end of the checkout process.