Ominous Tattie Problems

Just moved house yesterday, and had a look at the tatties I planted a while ago in the garden. Most are looking great, well watered, lush foliage, earthed up and just beginning to flower. A couple however are not looking so good. One (either a Red Duke Of York or an Anya) is just simply yellow, no lesions on the leaves but just looking like it is lacking something. It is at the end of a row, surrounded by weeds, I wondered if it was just suffering from too much competition. There was a healthy looking neighbouring plant had a single lesion in the middle of one leaf, similar to the dockens nearby, but no other signs of blight and no blight conditions recently, so I doubt it is even early blight.
Much worse, is a plant with curly leaves. (A Sante, I am pretty sure.) Looks ill from a mile off, and close up the foliage is not only rolled up to show the silver underside, but the stems are splayed and there is an ugly black blotch at the bottom of the stems where they enter the soil.
Normally I would just google or consult my gardening texts, but everything is higgledy piggeldy and I'm just not organised for it ! Anyone have any ideas of what may have caused this, or what I should do ? Does it need urgent treatment or can I leave it a few days while I finish off decorating in my last flat ?
Any help gratefully received !