"Mr Hancock said testing capacity had reached 51,000 a day by 23 April. He also ..."
Did it freck. Yesterdays' figures showed a huge leap of 50,000 because
"The difference between the cumulative numbers from today and yesterday for people tested is 50,499 higher than the daily increase figure. Cumulative testing figures include 50,499 retrospective reports of people who tested negative between 31 January and 24 April. These are now available due to a new reporting system that includes more laboratories reporting all test results. The overnight change reported is based on figures using the new system. The reporting system of positive results remains stable and no issues have been identified with this data." https://www.gov.uk/guidance/coronavirus-covid-19-information-for-the-public
There will not be 50,000 tests in today's figures.