Just a bit of feedback, folks....................
The mattress arrived the day before Good Friday, and I had to unpack it and leave it be for 24 hours. I love the feel of it, and to some extent I just want to stay in bed in the morning! My "hot joints" and aches and pains that I experience in the last hour or two of bedrest don't seem to have improved though (Arthritis runs both sides of the family though) To be fair, last night wasn't at all bad. It's a Miratex from T J Hughes and I think it is great comfort-wise and a fraction of the price of the market leader!
It sounds a bit pedantic, but I would not have thought, that there was any data suggesting that one of these mattresses would relieve the condition of Sleep Apnoea. As (officially) I no longer have the condition....I got discharged from the Sleep Clinic, last April, then I would not be eligible to get a return of VAT anyway. However, I am certainly not against anyone else getting a refund...good luck to you!

Ken