A self-portrayed informant at the organization which made the cladding utilized on Grenfell Tower has declined new demands to offer proof to the public request.
Claude Wehrle, who worked for Arconic, state he fears he may break a law in France which forestalls proof being given to procedures abroad.
A request letter seen by the BBC uncovers he is one of in any event two representatives who are waiting.
72 individuals were executed in the fire in North Kensington in June 2017.
The request is presently in its subsequent stage and is inspecting the reasons for the fire, including how the Grenfell Tower came to be in a condition which permitted the burst to spread in the manner it did.
Cladding investigations reveal other fire chances
No certifications for leaseholders over cladding costs
A month ago, Mr Wehrle told the BBC, working together with CBS, that he was unable to talk without authorization from Arconic's legal counselors. Arconic says that isn't accurate.
In spite of the fact that Mr Wehrle no longer works at the US organization, when reached by telephone in November in France, he guaranteed that law office DLA Piper was affecting his choices.
"DLA Piper is dealing with everything," he said. "Everything needs to experience them."
"I am a decent officer and I follow what is requested from me, and on this point, it is delicate and significant for me to adhere to the principles."
DLA Piper is a global law office which is speaking to Arconic and its present representatives during examinations by the Grenfell Tower Inquiry and the Metropolitan Police Service.
A joint examination by the BBC and CBS News has revealed messages recommending the firm was taking care of lawful ways to deal with Mr Wehrle recently.
In any case, in an articulation, DLA Piper said it was done exhorting "certain others related with [Arconic's design subsidiary] AAP SAS in France".
Arconic has been paying for Mr Wehrle to have lawful portrayal since July however focused on that it didn't have any impact over his choices.
Another firm in France, Navacelle Law, said it was currently speaking to him freely.