Physical services have been unaffected but limited access to online services continues to cause headaches

As cyber-attacks go, it could have been worse. In Nightsleeper, the new BBC thriller airing just after Transport for London revealed its systems had been breached, passengers are locked aboard as a train seized by hackers hurtles dangerously towards the capital.

In real life, the troubles for TfL customers are far less dramatic. The actual physical transport services, the buses, trains and tubes – many of which are effectively remote-controlled – have been unaffected by its cyber-attack.