Asthma, I think MrsCurly.
I loved the original programme - it's one of my all time favourite tv programmes.
You can get a box set of all the series on eBay at much less than the £200 retail but I bet they've gone up as a result of this revival.
I quite enjoyed this mini-series but, of course, they didn't have time to really get into any kind of depth.
I think one of the best episodes from the original series was when Rose was arrested with Lady Elizabeth (was that the daughter - can't remember embarassingly) during the Suffragette movement. The episode showed the force feeding by nasal tube when the women went on hunger strike in prison. Had quite a bit impact on me as a child...