Big ambitions. How big?
They way it is now could cope with a few hundred. Split it down into a few sub-groups with staggered starts each with their own lead and TECs and it would be workable. It would require a lot more Dr Bike work, a bigger halfway stop and maybe more than one sag wagon though.
More than that, 1,000s say, would need a greater spread of start times, route-sheets, fixed waymarkers and signing. At this level of numbers would it need portaloos?
The BHF ride has 10's of 1,000s and it probably represents an upper limit, otherwise they wouldn't cap the numbers where they do. It also has hundreds of marshals, closed roads, signing, lots of food stops, toilets, etc. The two occasions I have ridden it in the last few years it also had people being put in the backs of ambulances. If it were run at night and it were wet and cold it would be mayhem.
It would also be useful to know how many people abandon on the BHF ride and what they do then because their back up options would be limited at night so would need to be provided for.
It will be interesting to see how they take it on. If they want any whilst doing more learning I would be happy to help.