Mumlove,
I think the questions the Spectator article you linked to regarding the Imperial model re Covid are fair. Going back to predictions he made re Swine Flu and Foot and Mouth seem to be a bit ad hominem.
In addition, he does need to warn against worst case scenarios. We cannot ‘take a punt’ on his best case scenario, as the consequences on being wrong would be disastrous.
However, this will not be like a bad flu season as no one has immunity, so based on it infecting 40 million odd people over a short time horizon, 0.5% fatality rate would give circa 200,000 deaths and many many more hospitalisations.
I suspect, were hospitals to become overwhelmed, we would be looking at far more than 0.5%.
Where I do somewhat agree with you is the government do seem somewhat overreliant on Imperial. It would be far better to be listening to a range of advice.