Won't be able to make the 23rd, need to up town for a show starting at 5pm. Unless I set a land speed record around the course, and home again, just run out of time 
But, for those doing it, from their FAQ page ...
Is it right that mudguards and lights are compulsory?
AUK's regulations used to require mudguards - but not any more. Some events may require mudguards, but that depends on the individual organiser. In the Calendar, the code M indicates that mudguards may be required. Otherwise, they are not required, though their use might be 'encouraged' by some organisers.
Lights are required by British law if you ride between the times of dusk and dawn. In practice this could happen on any of AUK's events except a few summer 200s and some shorter events.
Are tri-bars allowed?
Yes.
