cm74,
I'm a little concerned when I hear "They send you a collection kit you just send a tooth when it falls out"
When the tooth falls out, most of the dental pulp (the stuff full of stem cells) has been re-absorbed and the tooth is to all intents and purposes useless. That's not to say you "might" have some viable cells in there but I hope you get a full report from Bioeden that specifies you have actually stored stem cells.
You should aim to have the tooth pulled before it falls out by itself.
For full disclosure, I work for Store-A-Tooth http://www.store-a-tooth.com and they use the only FDA approved tooth transport device, a critical component since the dental pulp starts degrading once it is removed.
Store-A-Tooth does service the UK and we have a section dedicated to Diabetes here:
http://www.store-a-tooth.com/diseases/diabetes
Here's a recent news update about a potential breakthrough in using stem cells to cure diabetes:
http://technorati.com/lifestyle/article/breakthrough-in-diabetes-treatment/
I hope at least some of this info helps...