Not doing this...
but I do have 'fond' memories of driving support for a mate, Kev Lally, who was riding for the
Rutland in the 90s. I remember standing by the side of the road very early on and seeing someone going past on an MTB with aero bars and slicks - turned out that Andy Wilkinson had snapped his best bike the week before and so decided to ride that rather than pull out. He still did about 490mls if I remember right, in a year when he was expecting to go beyond 500 and finally take the record (which was 508?). I think it counts as the most impressive riding I've ever seen. Kev did about 430 and came 5th. I ended up flaking out in a verge and being left to be picked up the next time round.
Have a good time.