I can't see it cutting any ice in LAX, not all agents in LHR will know of the Accessrail provision. In a way that's better (ie sorting it out in London) since once you are clear about arrival time then you can't be sure what the impact is for NCL flights / trains. And you'll be able to be accurate about that after the aircraft has pulled off stand in LAX. Note also that there is a tube strike tomorrow, and the Met Office are on strike as a random extra.