Found this in the Currys/PC World store in Hedge End, Southampton. Price on box was £299 but big poster on wall advertising this for £249. I asked the member of staff to honour the £5 off voucher (£15 Million giveaway deal) i was still waiting for, which he did. The store had 2 more left that i could see.
This product does not appear on their website so can only assume its instore only. Have no idea when offer ends.
As pointed out there is a cheaper deal here http://www.hotukdeals.com/deals/onkyo-ht-s3305b-3d-ready-5-1ch-av-r/801965
but its currently out of stock.