To insure your event with British Cycling there is a one-off registration fee paid for in advance of the event going on the calendar. 

A race levy (per entrant/per day of racing) is payable within seven days after the event has taken place and is applicable to all entrants (pre-entries and on the day). The amount each rider pays depends on the category of the race and is usually included as part of the entry fee.

Costs for both the registration fee and the rider levy can be seen below

Registration fee: £3

Levies

Levy: £1.50