Hi Don
Elliot Coleman is a well known organic gardener from the US. He has written many books and has been followed by most organic growers. If you look him up on you tube there are many videos all worth watching.
Pete
Plant your maincrop potatos early, even before your first earlies. They are then ready before blight really hits. You can also mound them up at the same time. It gives frost protection if needed and save you time later in the season.
Pete