We've stored our DD's cord blood. It cost us a bomb but we put the baby bonus towards it and DP's mum offered to pay half. Interestingly, because she was a c/s due to placenta praevia and I never went into labour we only got slightly more than the minimum amount they need to make it worthwhile.

I hope we never have to use it, but if we do, it's there for DD and any brothers and sisters.

You can opt for the cord blood to go to a public cord blood bank as well, although that doesn't guarantee it will be available should you need it. And if you want to collect cord blood the cord needs to be clamped almost immediately after delivery, so if you wanted to let the cord pulsate naturally that wouldn't be an option.