There were twice as many deaths than normal in Hertfordshire during the worst period of the coronavirus crisis.

Office for National Statistics figures revealed every part of the country had seen an increase in deaths.

The number of excess deaths in Hertfordshire hit a peak in the week ending April 17, with 153 per cent more deaths than the average for the previous five years.

Overall, the area had more deaths than usual in nine of the 15 weeks between March 6 and June 12.

The figures show Hertfordshire had the fifth highest rate of excess mortality at its peak out of the East of England's 16 areas.

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Brent was the worst affected area in England – 358 per cent in the week ending April 17 – but it was joined by two other London boroughs – Enfield and Ealing – and Thurrock, in Essex.

Excess death figures are seen as the most accurate way of measuring the effect of the crisis as they are not affected by the different ways countries record Covid-19 deaths.

The ONS compared the all-cause mortality of 23 European countries, taking account of age differences in the population. It found by the end of May, England had the highest levels of excess mortality in Europe, at 8 per cent above normal – ahead of Spain (7 per cent) and Scotland (5 per cent).

Charles Tallack, assistant director of the Health Foundation’s research arm the REAL Centre, said we must understand how and why the UK differs from its neighbours ahead of a potential second wave.

He said: "Areas for investigation should include what proportion of the population were infected before lockdown began, whether lockdown measures were introduced quickly enough, and how effective lockdown has been in preventing the spread of the virus through the population.

"And finally, we need to understand the impact of prioritising Covid-19 patients and how this has affected health care for non-Covid-19 patients."

The ONS said the first half of 2020 saw "extraordinary increases" in mortality rates across Western Europe, but added deaths were less concentrated in the UK than with the hotspots seen in other nations.

The charity the Health Foundation said this more uniform spread of the virus could explain why Covid-19 has taken such a "huge and deadly toll” on the country, although it also questioned whether the timing of the lockdown had been a factor.

A Government spokeswoman said: “This is an unprecedented global pandemic and our understanding of its impact on different countries and societies will improve as we learn more.

“At all stages we have been guided by the latest scientific advice, and the action we have taken has allowed us to protect the vulnerable and ensure the NHS was not overwhelmed, even at the virus’ peak.”