Hi @chrischatt
We approached a medical practitioner called Dr Martha Baz. She provided a comprehensive pre-visa assessment of our situation so that we could have an idea of whether or not it was worth going ahead. Obviously, there is a fee but we felt that it was money well spent, given the alternative. She was really helpful.
I'm assuming that it's ok to post a link. http://www.visamedic.com/index.htm
I hope that all goes well for you!