( 01.09 last night )

Leo, if it gets signed off - which would be around February  when the details of next summer's timetable will be known* - you'll know about it; they will start publicising it almost immediately and it's a big enough charity stunt that there would be a lot of coverage while it is actually taking place.  The whole thing will take the best part of a week to do...!!

*The whole thing depends on if the timetable will realistically allow it to go ahead; if there is too high a chance of failure at any point of it then it will be too high a risk, PR wise, to proceed with it.