The UK has recorded its biggest daily rise in the number of deaths so far in the coronavirus outbreak.

The UK hospital death toll rose by 563 to 2,352 on Wednesday, an increase of 31% on the total of 1,789 deaths reported the day before.

Department of Health and Social Care (@DHSCgovuk) UPDATE on coronavirus (#COVID19) testing in the UK:



As of 9am 1 April, a total of 152,979 people have been tested of which 29,474 tested positive.



As of 5pm on 31 March, of those hospitalised in the UK who tested positive for coronavirus, 2,352 have sadly died. pic.twitter.com/IUqkO6W3Dx

The Department of Health and Social Care said as of 9am on 1 April, a total of 152,979 people had been tested, of whom 29,474 were diagnosed as positive – an increase of 4,324 on the previous day.

Wales recorded 29 new coronavirus-related deaths and there were a further 16 deaths in Scotland and two in Northern Ireland.

As of 5pm on 31 March, of those treated in hospital in the UK who tested positive for coronavirus, 2,352 had died. On Tuesday, the previous record day, there were 381 deaths and 3,009 cases declared across the UK.

On Tuesday the medical director of NHS England, Stephen Powis, said “green shoots” of hope were emerging that physical distancing measures were beginning to work.

But he warned: “It is really important not to read too much because it is really early days. We are not out of the woods, we are very much in the woods. So green shoots but only green shoots and we must not be complacent and we must not take our foot off the pedal.”

London continues to report the highest number of deaths proportionally, accounting for more than a third of England’s total. NHS trusts in the capital have now registered 728 deaths from coronavirus. This includes London North West Healthcare NHS trust, which recorded a further 20 deaths, according to the latest NHS England figures, taking its overall total to 113, the highest of any trust.

However, the figures are not an accurate picture of the deaths within 24 hours, as a number of deaths announced in Wednesday’s release occurred earlier in March. One of the deaths, for example, took place on 15 March. Also the NHS England figures do not include deaths outside hospitals, including those in care homes and the community. A Guardian analysis of ONS figures earlier this week found there were almost 24% more coronavirus deaths than had previously been reported.

The government has faced criticism about the lack of testing available for NHS staff. Only 2,000 NHS frontline workers out of about half a million have been tested for coronavirus, despite up to one in four in some areas of the country being off work with suspected symptoms.

Responding to criticism of the UK’s low testing numbers, No 10 said a “clear instruction” had been issued to hospitals to test as many staff as possible, with trusts allowed to decide how to split tests between workers and patients.

The latest figures reveal that only 500 tests a day are being carried out on doctors, nurses, paramedics and other medical staff.

Labour’s Richard Burgon tweeted: “Two weeks ago today Boris Johnson said at PMQs that coronavirus testing levels would increase to 25,000 per day. Two weeks on and the UK is averaging 7,500 tests per day. Enough time has been wasted. This needs sorting. Lives depend on it.”

Downing Street said the coronavirus testing capacity stood at 12,750 a day – but only 8,630 tests were carried out on Monday.