Personally, I would do it if my knees were ok for riding. BUT, I would stick the ends of my hair to my body & I would not be riding Sunny, I wouldn't trust her not to pratt about & dump me on the floor. She is the type to get a bit joggy & excitable if the mood takes her... Imagine falling off naked & then having to re-mount!!!!
I actually think it is an excellent idea, I just wonder how many men will be hanging around Hyde Park once they clap eyes on 30+ Lady Godivas'! Lol
Good luck to them all & I hope they raise a good sum for a very worthy cause.
If you want to donate or know somebody brave enough to do the ride then you can contact Vicy Jewson at - firstname.lastname@example.org