Ah, I see. Sorry about the confusion. This post has grown so long it's difficult to remember what's at the beginning of it!
Sylv was, I think, gonna lead the first part, probably out towards Boxhill, and then I was gonna do the rest. But as I mentioned above, he's not feeling too well at the moment, and doesn't know if he'll be able to make the ride...
So I'll probably lead the whole thing. I pre-rode the first bit to Boxhill this evening to make sure I could guide it ok, and managed to put together quite a fast direct route (thanks Aodan!), mostly off-road. We do start on the road - for just under 4 miles - but I figured that would be a nice treat for the roadies.
I'll post up something tomorrow with the final details.