Hillsborough campaigner and shadow health secretary Andy Burnham said: "Starting this process off three years ago, we couldn't have hoped then that it would come to this.
"It is unbelievable what the families have been through. For them to get on a coach in Liverpool at 5am and come down to London and be told what they should have been told 23 years ago says so much about their determination."
The Hillsborough inquest verdicts of accidental death have been quashed by the High Court and a new police investigation has been announced.
Families of the Hillsborough victims are on their way to London for a historic hearing. They hope to hear the inquest verdicts overturned.