Thanks Russ and happy hippy.
I guess I am being far too technical in searching for a weight. Farmers here are the same, its all ' big bail, small bail "
I am actually tempted to move into my barn, and keep it a while. Prices here are very low, with a 200 kilo bail, selling ( maybe ) for 25 - 30€. Apparently we are awash with hay, due to the perfect conditions this year.
Kevin