To enter British Cycling road races you normally enter online on the BC website orwww.riderhq.com. Standard closing dates for most open road races is the Sunday three weeks before the event. For time trials it is normally the Tuesday a week and a half before the weekend of the event. Surrey League and South East Road Race League will normally operate more relaxed closing dates.
A comprehensive events list of all open time trials is published on the CTT website each January for the forthcoming year. To enter an event: many now accept internet entry (following link from the events list) or alternatively you can use the paper entry form, which you send to the event organiser together with a cheque (usually made out to the promoting club) for the entry fee. Entries close around 10 days before each event. Club time trials are usually enter on the line.