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My oh my, Jennie, that looks disgusting. It could be a very bad case of Stagonospora Curtisii but surely not if it looked fine a week ago. It could be damage/stress to the roots causing the leaves to die-back prematurely then get overtaken by some form of rot. Are you sure the bulb is not discoloured?
Maggi it was still on iPlayer so I whizzed through the programme to the right spot