Sorry, have been inundated with paperwork so could not reply to all these wonderful responses.
Verdun, Nut, Panda, and everyone else who has been so positive; yes of course it will be probably 3 months before anyone can plant in the worst hit areas.
Dove; I am thinking of Horticultural Societies/Gardening Clubs in the affected areas.
Brumbull; thank you for your input, but bear in mind that all veg produced as recently as the late19th early 20th century was manured with 'night soil'. As long as veg are VERY well washed, they should be ok.
Next week I will try to contact relevant organisations in the flooded areas; if anyone knows people in these places, please let me know.
We can all only grow the plants that we know and would normally grow; for me that is veg seedlings and some annual flowers. Though could do Pelagonium cuttings.
Let's get on with it