I was pissed last night, and doom reading, which is a bad habit. But I was looking at the Sage modelling, which, so far as I could tell was pointing out that the vaccine roll out estimates are optimistic, for various reasons not everyone is going to get a vaccine anyway, and anyway vaccines don't offer 100% protection, so opening up risks a large wave of infections, and a small percentage of a very large number is still a large number so if there is another wave then large numbers of people are still going to die. Also, I've seen it pointed out that they don't tend to put old people in ICUs, so a wave of young people getting hospitalised could very quickly overwhelm ICU capacity.
But I honestly don't know. Hope I'm wrong and it will be fine. I guess if they are being honest and they do slow down opening up if the figures start to look nasty then it will be. But past experience suggests they are not.