If I were you I'd check out the LCA website (I think they have legal info - and I'm assuming you're UK from the email address), or release. Another good place is UK420.com - I realise it may look like I'm spamming, since it's another pot message board, it's just this one's in it's infancy, but UK420 has lots of members who are growing, many of whom(like myself, but I'm a recent member of the LCA) are involved in pro-cannabis activism, and many of whom (again like myself, but again, I'm new to the scene & don't want to give you any misleading info) are medi users who will have knowledge of the law. I don't know for sure, but if you're in the UK I doubt the medi angle will make any difference, Chris Baldwin was recently sentenced to 6 months for his involvement with the worthing coffee shop, and he is a medi user who was just seeking to provide other medi users with a safe environment away from the dealers.
Good luck with it, anyway.