I've warned you before, now I'm telling you again : Britain has been lost.
Just as if I were the commander of a zombie defense force, I am telling you that your life depends on recognizing when a city has fallen to the undead. Staying behind when the critical threshold has already been passed means you're going to end up lunch.
Know when to get out of Britain. That time is already past. If you have not left already, you should make preparations to as soon as possible. Don't get caught there.