Should I spray against blight?

I bought a pack of dithane a few days ago, thinking I would spray my outdoor tomatoes as a precaution, as I think it's only a matter of when, rather than if the blight will arrive. Trouble is, I can't bring myself to do it    There is masses of fruit on the plants, much of it ripe or semi-ripe, and the instructions say not to harvest for 7 days after spraying. Don't know if I fancy harvesting it at all after spraying with noxious chemicals. I have made a number of excuses for not getting round to it, eg it's too windy, or the sun's too bright etc, but I just don't know if I should spray or not.

It wouldn't be the end of the world if I lost them, I have plenty more in the greenhouse, but it would be a terrible shame, as there is an awful lot of fruit there to go to waste.

I could pick all the ripe/beginning to ripen fruit before spraying, and ripen it at home? Does anyone know how harmful it is to eat the sprayed fruit? Would it be ok after a good wash?

"too late now"

Not necessarily, if you can hit the blight hard and fast.  The instructions on the Dithane pack says to spray tomatoes as soon as you see symptoms,  with potatoes you have to spray before you see symptoms.

I pick all ripe and nearly ripe fruit before I spray then leave them for a week before picking again.

Gillie

I was told that if you spray with Bordeaux mixture (copper) you should be able to eat the tomatoes any time, since its only surface acting.
Do many use B Mixture?