The DCSF's GrowingSchools joint campaign - Year of Food and Farming have just launched a new offer in conjunction with one of their sponsors B&Q - Free Tomatoes seeds for one year group of each primary school.
For the full press release - details on how to claim an additional bag of soil and enter a competition please see this page -
Year of food and farming.org.uk
For the application form please see this page of
FACE-Online.org.uk (Farming and Countryside Education

)
~~~~~~~~~~~~
I have looked but can't find anything that mentions Children's centres or Pre schools which seems a real shame.