BA Postal League
Annual postal league tournament for clubs. Runs from November to March. Separate leagues for recurves and compounds. Deadline for entries end of September.

Mayflower Archers Tournament Calendar
This is an excellent resource for archers looking for information on UK archery competitions, especially record status shoots.

Greenwood Osterley Diary
Another useful diary of events, geographically centred in Middlesex and covering most important shoots within easy travelling distance of Sussex

Sussex County and Club Recurring Shoots
A month-by month calendar showing the approximate weekend of annual events