The reason for this is medically clear - babies born before a certain point gestation (22 weeks from conception/24 weeks from last menstrual cycke) do not have the lung tissue developed in order to survive. It's not the NHS "rationing" care at all - no hospital would attempt to revive this baby in most Western countries. Sorry to be blunt, especially to those that have lost babies around this threshold, but it is simple biology. There's a reason that 24 weeks is called "viability day", because it is the point at which most hospitals will attempt to revive a premature baby. I believe that if there is evidence it has the potential to survive maybe a few days short of this point, resus will be attempted, but that's down to discretion.
The fact that survival rates for pre-24 week babies* have not increased in the past 10 years should spell out that even with huge leaps in science, at some point it's just too early for a baby to live outside of its mother.
Typical Daily Mail spin that just gives everyone the wrong information.

* link:
http://www.medicalnewstoday.com/articles/107234.php(also the discrepancy between 22 and 24 weeks here is because some use measurements from last menstrual cycle rather than from conception, which is 2 weeks later)