Good Morning Britain. The expert, who spoke from his home via video link said that if the UK had gone into lockdown just one week earlier, the total death count could be less than 10,000.He said: " I feel that we would have less than 10,000 deaths if we would have gone into lockdown just one week earlier."Sir David continued: "I think the government position was made clear a few times, once the Prime Minister gave his speech about how we would ride through lockdown while other countries were going into lockdown, our economy would grow and we would emerge like Superman."What he was referring to was a policy of herd immunity.