Potato problems, (Swift and Ulster Sceptre) I'd appreciate your views on these please
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Almost certain its not blight.
Maybe some sort of deficiency?.Possibly Manganese
Sorry I cant help anymore.
If it is blight the stems will be affected as well, so I agree with Fork.. probably not the Blight... :-\
Dont know if this page will help at all but it lists and shows mineral deficiences in spuds
http://www.hbci.com/~wenonah/min-def/potato.htm (http://www.hbci.com/~wenonah/min-def/potato.htm)
Good info here on pests, diseases and disorders:
http://www.potato.org.uk/department/knowledge_transfer/pests_and_diseases/ref.html (http://www.potato.org.uk/department/knowledge_transfer/pests_and_diseases/ref.html)
Browning between the veins like that is Magnesium defficiency