Thanks for reaching out, looks like you have an exciting project coming up!
I'm not going to speak for the list because there might be individuals from
Tunisia/Italy on it, but in terms of the easy set-up to use yourselves,
have you taken a look at the balloon mapping tool page?
http://publiclaboratory.org/tool/balloon-mapping. Once you have the basics
of the kit together (materials, guides, process detailed on this page),
this listserve is a great resource for question answering and problem
solving. We also sell a balloon kit if you are not interested in getting
the pieces together yourself:
There is also a person that I worked with during the BP oil spill on aerial
mapping that is currently a PhD student at Goldsmiths and has taught a
couple of balloon mapping workshops there, I'll email you off list with his
contact information. Additionally, I've been working with the University
College London ExCiteS project who will be utilizing balloon mapping in
some of the work that they are doing in London (
http://publiclaboratory.org/place/mildmay). These just might be some good
local London based contacts for you to have as your project progresses.
Public Laboratory for Open Technology and Science