The iOS and Android apps have been withdrawn, with no notice unfortunately. It all happened rather more quickly than I expected.
Please use the near identical Tapatalk to access NN instead:
https://itunes.apple.com/us/app/tapatalk/id307880732?mt=8
https://play.google.com/store/apps/details?id=com.quoord.tapatalkpro.activity
Please use the near identical Tapatalk to access NN instead:
https://itunes.apple.com/us/app/tapatalk/id307880732?mt=8
https://play.google.com/store/apps/details?id=com.quoord.tapatalkpro.activity