I have lived in this area for the past eighteen years so have a fair idea. Driving between Falmouth and Carbos Bay is not an issue, "The beast" is a minnow compared to a lot of traffic that will use these roads. Tregenna Castle will be easy for landing helicopters so wouldn't that be the most likely way VIP's would get in and out, probably flying back to St Mawgan, or, is even RAF Chivenor an option? What is likely to be more of an issue in Falmouth is finding beds for all of the media.
By coincidence I also happen to be a volunteer with D&C Police so will possibly be a tiny cog in the huge traffic flow and management task, should be really interesting!
Finally I hear there is a plan to try to launch the first space flight at the same time, Better get a bigger car park!!