Have bought our seed potatoes from Jamieson Brothers for the last 5 years. Always had great success with the potatoes. The company itself is always easy to deal with. They help me with any questions I may have, the seed potatoes always arrived in good time and in good shape. Seem to have a good selection including heritage which I try to order as I reckon the whole point of an allotment is to grow stuff you can't purchase in a shop. I always order in the Autumn so the delivery date is never known by me but I did get heads up when it was due to arrive and also the option to delay to another day if not convienent.