Transport for London (TFL) has stalled the final approval of the massive King's Cross redevelopment, the AJ understands.
The vast transport quango is reportedly holding up London Mayor Ken Livingstone's intention to give the project the go ahead.
According to rumours, the influential organisation has several problems with the huge project, masterplanned by Demetri Porphyrios and Allies and Morrison, which have yet to be resolved.
The scheme to completely transform the large area behind King's Cross station in London was given the green light by Camden planners last Thursday (9 March).
Following that meeting, there was a widespread belief that Livingstone would give the scheme his seal of approval at the MIPIM property festival in Cannes.
But this plan was scuppered late last week when Livingstone's transport agency told him that it was still uncomfortable with the project.
This hold up will come as a major disappointment to developer Argent and its boss Roger Madelin, who had believed they were just days away from securing full planning permission. by Ed Dorrell