LONDON - Britain has not achieved a good outcome in dealing with the Covid-19 pandemic, the government's chief scientific adviser told members of Palirament attending the Commons Science Committee. He added that he was sure mistakes had been made.

Sir Patrick said it would have been "preferable to have had much greater testing capacity earlier on" and also stressed that adequate "data systems" need to be in place so that authorities have the information they need to deal with emergencies like the pandemic.

Britain has the highest Covid -19 death toll in Europe, which, including deaths from suspected cases, is nearly 56,000 according to a Reuters tally of official data sources.

Prime Minister Boris Johnson ordered a lockdown on March 23, though a former member of the government's scientific advisory group has said that introducing measures a week earlier could have halved the death toll.

"It's very difficult to know exactly where we stand at the moment. It's clear that the outcome has not been good in the UK ..," Patrick Vallance told lawmakers, adding that some countries had done worse.

"There will be things, decisions made, that will turn out not to have been the right decisions at the time, I'm sure about that as well."

He said the advice to introduce stringent lockdown measures was made when the rate at which the epidemic doubled increased to three days from six or seven days beforehand, but added that such advice could only be given once the data came in.

Heath Secretary Matt Hancock, questioned about Vallance's assertion that scientific advisers had recommended measures be taken earlier, told lawmakers the lockdown had started on March 16, rather than a week later when Johnson told Britons they must stay at home.

"The 16th of March is the day I came to this House and said all unnecessary social contact should cease," he said. "That is precisely when the lockdown was started."

Vallance said there were "pretty strong hints" the new coronavirus was seasonal and could return in future years.

"What we're dealing with now is a suppressed first wave," he said. "I think it's quite probable that we will see this virus coming back in different waves over a number of years."

Coronavirus deaths in the United Kingdom have reached 45,119 so far.

13,778,635 confirmed world cases and 588,635 deaths.