Of course it is anxiety provoking having a baby and of course things can go wrong in the best hospitals. The fact remains that Kings and St Thoms are both excellent hospitals and any difficulties experienced are likely to be due to the volume of women and the staff available at the time (the number of births at present simply is too great a demand for our maternity services in their current state). I can pretty much guarantee that either during your antenatal or postnatal care you are likely to experience some difficulty because of capacity or because of staff are spread to thinly. From personal experience the only think I would say is pick the hospital with the most relaxed visiting hours (if you end up in there you will valie your partner being allowed in at all hours) and the most convenient travel/parking from you as the medical care you get is ultimately likely to be fantastic at either hospital. When I had my own children I experienced a host of complications, was an in patient on the labour ward for a week and stayed in another week after the birth (babies delivered prematurely by c-section). In that time I saw an awful lot of women come in with birth plans, music, intentions for water birth etc etc. They had chosen their hospital and planned every detail and I and watched it all fly out the window when the labour (and sometimes the complications) came. You can fuss and plan all you want, in the end the baby is coming out one way or another and there will be plenty of help when that time comes from fantastic staff and state of the art equipement. In my blunt way what I mean is you will do fine, wherever it happens.