It's possible to enter online now.
There is a wide range of events, including weekend tournaments, weekday tournaments, and age-group events from Under 8 to 65+.
Entry to the main British Championship is either by qualification or exemption. Players graded 218 or higher gain automatic entry, as do those rated 2350 or higher. There are other ways that players can qualify, for example all titled players (GM, IM, FM) are able to enter.
Others can qualify due to performance in certain events. Amongst the list of qualifiers is John Peters, following his excellent score in the Major Open at last year's Championships in Bournemouth. Also qualifying to enter are Ed Player (from the Isle of Man Masters), Graham Moore (Hertfordshire Open), Alan Merry (titled) and Adam Taylor (Junior 180+ last year).