For over two months from April 2020, Met officers were able to eavesdrop on messages sent by 1,400 suspected criminals who were unaware that their supposedly secure EncroChat encrypted phones had been compromised by a French hacking operation. It was, according to the six-part BBC podcast, Catching the Kingpins, the biggest organised crime bust in British policing history, leading the Met Police to arrest 950 suspected criminals and secure convictions against 750 of the most dangerous criminals.