What a mangled bunch we are.
The only thing I'm sure of after twenty something years of managing my back related pain/issues is that no two cases are entirely the same. No matter how similar they are.
In my case. Following advice from health pro's on both sides of the divide, I spent the first year attempting to sleep on the floor and managed no more than an hour a night. Taken with the number of episodes I've suffered getting up off the ground, these are the worst situations for me. Which is why I'm pleased with the feedback in this thread concerning hammocks. Given the amount of resources I've used up on the purchase of various Orthopedic Mattresses, over the years, a few extra pounds for a hammock could be getting off lightly. I'm fortunate to have the thickest Tempur mattress, and since owning one of these I've managed 3-5hrs sleep a night. Although what may apply for me, may not be the same for others.
I'm fortunate to have access to woodland very close to home, which negates the cost/need to travel elsewhere and test out a loaner. In which case, based on your suggestions, I shall now begin the selection process for my very first hammock.
Thanks again to all for you advice and suggestions, I will let you know how it goes...