Total speculation on your part.
i believe that the neither driver nor minister gave details to the cyclist.
So either the Minister directed his driver to exchange details with the cyclist which he should have done as his employer, the cause of the collilsion, a witness to the collision and the goddamn transport minister and the driver disobeyed this instruction and has presumably been fired for committing a technical hit-and-run and disobeying the minister.
OR
He didn't direct him to exchange details, thus "'let" him leave without doing so.
Or do you have a 3rd option? Maybe there was not incident at all, and it's a clever piece of CGI staged by the Guardian to trap a member of the Government.