Is this potato blight ?

... but Tee Tree Oil ? I can't see that being harmful but I will abide by the rules nevertheless.

You still don't understand what we mean me dear.  We've not said that it is harmful or safe.  It's just not licensed for use as a pesticide or fungicide so can't be recommended by us.

My Red Roosters that I pulled the foliage up and binned have started sprouting again with healthy leaves. Is there a chance I could get a crop ?