Entries are in advance via RiderHQ but don’t close until 5pm on the day so no excuse.
With regards to transponders, affiliated riders pay £4 on the night and are eligible for track league points and prizes at the end of the season. Guest riders do not pay additional fee for transponder (but have to leave a refundable deposit). In short, the difference between guest riders and affiliated riders without a transponder is being eligible for prizes.
In case you don’t know, entry for guests is £13, affiliated riders pay £9. Affiliation for adults is £15.