Right, this is what it happening. The site went live and started to develop problems. For some security reasons we were denied access to our own servers so couldn't fix things. We then had to take the decision to roll-back to the 'old' version. We should have regained access to our server yesterday to fix things, but that was not possible (for all sorts of technical reasons). We're hoping that this will now happen this morning.
Assuming that is the case we can start to investigate the causes (we have a fair idea already) and hopefully a rollout soon after.
It'll be worth it.