Key figures in Formula 1's governing body the FIA are barred from a meeting on Wednesday in a dispute with president Mohammed Ben Sulayem.

The NDA document reportedly “forbids members from discussing matters pertinent to the FIA outside official meetings”. Insiders have claimed that the NDA was demanded directly by FIA president Mohammed Ben Sulayem over concerns that details could be leaked to the media, the BBC Sport report adds.

Robert Reid and David Richards refused to sign an NDA and were barred from the World Motor Sport Council meeting