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So it's been chosen over the Oxford one, assumingly because it's passed the approval stage soonest.
Despite the higher cost, I suppose it could be argued it could save more by helping to get things back on track sooner. Also maybe its rate of effectiveness being the highest might give people more confidence, rightly or otherwise.
Be good to know the most vulnerable will be safer soon and maybe those of us who are concerned about someone in that group can relax a bit.