I also bought 2 new leather sofa's from DFS 3 years ago, shortly after my 13 year old Daughter suffered severe skin rashes from head to toe,incorporating hair loss, I have now gathered lotsof information which I am taking to her dermatologist as he has said on numerous occasions that he has no idea just where this condition has come from. I have phoned DFS and they said that they do not use the offending product or use any anti moisture product in their furniture, personally I am not to sure, my pet cat has also suffered skin loss and has had to be treated at the Vets, again they do not know just why this condition has come to light.
I do accept that there are many different reasons why these conditions come to light, but the burning skin,hair loss and even pet ailments are very much a big coincidence in this case, not many cases are mentioning DFS but the numbers are indeed growing,pursue it by all means, but you will have to get Legal advice to get to the information that you may need to view to clarify this position, good luck,and look at it this way, would you expect DFS to admit liability even if thet were responsible, it doesnt work like that,good luck again,and make sure you do EVERYTHING to get to the bottom of this strange enigma.