Scientists often disagree and like academics generally are more than happy to fight battles which have little to do with science and everything to do with ego and professional jealousies. This makes a nonsense of the increasingly pathetic bleat of Johnson and co that “We are acting on the best scientific and medical advice
The upshot is politicians not choosing the “best and medical and scientific advice ” but the advice which best suits their political narrative and covers their political backs. Moreover, logically , politicians cannot be said to be following the best scientific and medical advice through choice because they are not qualified to choose between competing professional medical and scientific advice .
In short, “the best scientific and medical advice ” is a ploy to evade political responsibility
Living In A Madhouse 
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The politicians have to say that because not to do so would lay them open to the comment ” why did you not listen to the experts “. It may well be they discuss and consider what the experts say and choose what they think the most suitable .It is not an enviable position to be in as whatever they do, someone is going to find fault, and probably for self aggrandisement , publicly say so. And anyone can be wise after the event. The government has to weigh up the balance between public safety and the economy, the effects on which of this virus will have I don’t think has fully sunk in with many yet. To start up production etc is one thing but to whom to sell the products is another matter due to lack of money generally.