I use organic chicken pellets and have used 6X to great effect in the past too, plus seaweed, nettle and comfrey teas, bean trenches as well as farmyard and poultry manure (obviously - not all at the same time!)
I stopped using artificial fertilizers when I overdosed some fruit bushes and killed the lot years ago! I think I now understand a lot more about plants and their nutritional needs since switching to organic methods.
I did have the blightwatch Smith period warning text messages screaming at me for a week, but just couldn't get up there to spray when it wasn't raining! I am a little miffed as it looks like I have been unlucky - my plot neighbour hasn't been affected by blight and I know they don't spray. The plant which sprouted from a volunteer tuber also hasn't been affected - clearly a case of Murphy's law!
I am awaiting a kit from the potato council to get it checked that it really is blight. The earlies had been in long enough to produce a great crop, the mains were the ones that could have done with being in a bit longer as they were on the small side.
I am waiting for the tomatoes to get blighted now, so have sprayed these. I hadn't even seen blight until three years ago when my garden tomatoes succumbed, but now it seems almost a dead cert that we will get it
It is heart breaking pulling up tomatoes in particular and throwing away blighted fruit.
Good for you for getting to them in time.