Photograph: Tim Ireland/PA

Cycling campaigners are already exerting conspicuous pressure on Boris Johnson and Transport for London to alter their plans for Blackfriars junction to make it more cyclist and pedestrian-friendly, as the Guardian has extensively reported. Now a separate challenge to TfL's approach to the safety of pedestrians and cyclists in the capital will take the form of a corporate manslaughter charge, if one of the authors of the Kings Cross Environment blog has his way.

In a powerful piece posted on Friday following the death earlier this month of 24 year-old cyclist and fashion student Min Joo Lee at the junction of Pentonville Road and York Way, William Perrin drew fresh attention to a report compiled for TfL in 2008 on the street environment in the area around Kings Cross and St Pancras stations, which concluded that road-crossing provision was "inadequate" and that there were "widespread deficiencies with regards to the pedestrian environment in this area."

The report made specific mention of the Pentonville Road-York Way junction, where Euston Road and Grays Inn Road also converge. It noted "just how aggressive vehicles are at this point" and described casualties as "inevitable" and rush hour periods as "a battle ground". The report was never published by TfL, and Perrin obtained it only after making a Freedom of Information request.

Kings Cross Environment has long been urging changes to this junction's design in order to make pedestrians and cyclists safer. I'm not surprised – I'm intimidated by it even on the increasingly rare occasions I drive through the area, and would no more cycle there than swing from a tenth floor balcony. Camden New Journal has reported that an improvement scheme had failed to start last month as planned.

William Perrin's case is that TfL's bureaucracy has failed to give cyclist and pedestrian safety sufficient priority at a confluence of heavy traffic-bearing streets for which it is responsible. He put it this way on Friday:

There seems to me to be negligence here in not taking timely substantive action upon a crystal clear report TfL had itself commissioned.

In an update on Sunday Perrin explained that he had written to the coroner who will preside at the hearing into Min Joo Lee's death, enclosing a copy of the report and asking him "to consider raising the issue of corporate manslaughter with the CPS [Crown Prosecution Service]." Today he has posted a copy of the letter he's written to the senior Met traffic management officer examining the death. He sent a copy of the report to the officer too.

Speaking to me earlier today, Perrin said that the situation at the junction has scarcely changed since the mid-Nineties despite still-growing numbers of cyclists on the roads and the Kings Cross-St Pancras transport hub being part of the huge Kings Cross regeneration area, which has major strategic significance in the development of London. "TfL has not delivered a strategic response," he says, "and that is not acceptable." I'll be following future developments in this matter with interest.