(n.b. I don't believe Liz and C are doing this unsupported, but I could be wrong...)
If I can ride for 24 hours across Wales and (partly) back without support, I think I can manage the same period up and down the A41.
But currently I'm undecided - support will most certainly increase my distance, so I need to decide what my target is, and just how much effort I want to make recruiting. The logistics are in many ways simpler unsupported (just like PBP, but with less clobber). Personally I reckon a clueless, sulky support team would detract from the ride, even if I ended up riding further. I don't expect to win any prizes for this!
The bike I'm using will work in both scenarios (although support would also allow me to bring a spare!).