Mass rapid testing is just the latest in a long line of game-changing Covid-19 breakthroughs hailed by Boris Johnson which may not deliver on the promise.
The Prime Minister promised the testing regime could help local authorities work towards reducing their risk level before Christmas.
And on Thursday he even suggested negative tests could be used to allow families more freedom, even in areas with heightened restrictions.
But today Ministers admit the scale of the operation means some areas might get the tests before others. Here’s a round up of some of the times Boris Johnson’s promises of light at the end of the tunnel have been premature.
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