Planting potatoes

I read on many different gardening forums every day when should I plant my earlies and my maincrops? The simple answer is that you should plant them all at the same time if possible and let nature take its course.
Earlies are called earlies because they mature earlier than maincrops.
Maincrops take longer to mature than earlies so to make the most of them and avoid blight as much as possible you should plant them early.