I think it stoo late for Bordeaux to help my toms, especialy whilst the weather continues to be wet. As soon as it is applies it will be washed off without doing any good at all.
My first experience of blight was 5 years ago in 2002, when my entire outdoor crop was devastated. The following year was of course hot and dry so no blight risk. The next time was in 2004, but I only got it on some bush types planted in the ground far too close together (i realised too late - a lesson learnt there). My pot grown cordons escaped somehow. Since then If the weather has been even slightly damp around late july/early august (the USUAL danger time for blight to hit) then i would give them a preventative spray of bordeaux, which seemed to work.
This year of course the blight has hit much earlier than expected and has caught me out somewhat (and many of you as well i guess). I did not realise what was happening untll it was too late.