Where can I buy Organic Oats in the UK?

Hi Folks

Does anyone have a clue where I could source organic oats in the UK. I have a new flaker and want to try flaking my own oats.The only place I can find is http://www.grains2mill.co.uk which comes out very expensive once you add £9 delivery costs. Any help would be very much appreciated.

 Regards

 Andy