United Kingdom 
Apologies for failure to acknowledge replies to my question, 9 August (potatoes). Computer fault. Sorted now.
My thanks to Snoopdog and Steragram. Yes, not a good thing to do repetitive planting of the same crop but sometimes circumstances dictate.
Snoopdog enquiry: Commercial product Gro-Sure Organic Farmyard Manure.
21 Aug, 2013
Answers
No problem John. Hope you have a good crop next year.
21 Aug, 2013
John, this comment would be better posted with the original question.
That way, people who answered or commented would be able to see your thanks.
21 Aug, 2013