Andy,

I'd contact this lot for starters if you did fancy doing a talk in Southampton or the Hampshire area. They are the fountain of all knowledge, and blooming lovely people! :o)

http://www.octoberbooks.org/links.htm

I'd e.mail the October Books link for starters. There is an Environmental Day at The Hobbit Pub, Southampton on the 30th April but think you've probably just missed that one!

Nat