Test and Trace chief Dido Harding has been ordered to self-isolate by the government's own coronavirus app.
The embattled Tory peer revealed she had been contacted by the app and told to self-isolate for nine days.
She joins Boris Johnson and almost a dozen Tory MPs in having to quarantine, after an MP who visited No10 later tested positive. The incidents are not known to be connected.
She tweeted: "Nothing like personal experience of your own products ....got this overnight. Feeling well. Many hours of Zoom ahead."
If a contact of Baroness Harding's tested positive, the screenshot suggests it took five days from meeting the contact to receiving a notification this morning.
That is because anyone who's been in close contact with a Covid-19 sufferer has to isolate for 14 days from the last time they met that contact.
It also suggests the app may have reached Baroness Harding before her own human-run Test and Trace system did.
The isolation time is 10 days for people who suffer coronavirus symptoms, but Baroness Harding said she was "feeling well".
The NHS Covid-19 app uses Bluetooth to detect when two app users come into close contact.
It is separate to the Test and Trace system run by Baroness Harding, which has repeatedly come under fire for the number of contacts it manages to trace.
The outsourced system - run largely by corporate giants Serco and Sitel - reached just 60% of close contacts of people with Covid-19 and told them to isolate in the most recent week.
It comes nine days after Baroness Harding's Tory MP husband, John Penrose, was told to self-isolate by the app after potentially coming into contact with someone who has coronavirus.
The Weston-super-Mare MP said on Twitter : “It never rains but it pours…. my NHS app has just gone off, telling me to self-isolate, which I’m doing.
“No symptoms so far *crosses fingers*”
Asked if he had spoken to his wife about it, he told the PA news agency on November 9: “We are trying to make sure we are doing it by the book, if I can put it that way.
“Her NHS app has not gone off, so it’s someone I have been in contact with rather than her.”
