Stock a wider variety of organic produce from local, properly regulated and verified suppliers. Produce should be clearly labelled and verified by the Organic Soil Association or another adequate body. Multiple types of organic produce for each food group should be available, with some (like fruits and vegetables) having many options.
Why is this important?
It is important for our overall health, the affect on the environment and our ecosystems and also to support local suppliers.
Rather than shipping garlic in from China, for example - where it is nearly impossible to regulate and guarantee that the produce is organic. There are rumours of the Chinese garlic being bleached as well, so it's far from organic and far from our plates. Local suppliers are the way to go!
I have noticed recently that the large Tesco in my area is no longer stocking as much organic produce as it did before e.g. organic potatoes and organic cheese have been taken off the shelves, and I see no possible justification for this because both were selling well.
I also think it's important for supermarkets to clearly label in detail where their produce comes from, not just stating which country it is from and labelling it 'organic' with no proof of regulation!