thanks for this Bex. I had the filling material tested on the Voll machine by my biological dentist, but he said (somewhat surprisingly) that serum tests were much more accurate.

I think I will try to see if there is a Clifford type testing laboratory here in Europe or the UK, or failing that go to my GP and try to explain to her what I am trying to do. Don't hold out much hope on that one.

thanks again.

Nicola