On 5 May, the first trial of the NHS covid-19 app started on the Isle of Wight. Since then information on the app’s development has been scarce. It has been beset by delays, with media reports suggesting that the app has some technical problems with accurately estimating distance between phones. That is worrying because the app is intended to expand contact tracing in England. When will the Health Secretary publish the results of the pilot and outline his plans for a wider roll-out of the app?