What are the conditions one needs to meet to become a UK citizen?

---For those not married to a British citizen the requirements are

five years legal residence in the UK

indefinite leave to remain or equivalent must have been held for 12 months

the applicant must intend to continue to live in the UK or work overseas for the UK government or a British corporation or association.

the same language and knowledge of life in the UK standards apply as for those married to British citizens ---

According to Wikipedia.

Under major proposals unveiled by the government, anyone wanting to become a UK citizen must show an understanding of the language and the law.

Applicants would sit an exam at the end of the course, likely to be on a similar level to a driving test. Failure would not affect their residency status but would prevent applicants from gaining a British passport and the right to vote.

The system has been drawn up by a team of citizenship and nationality experts led by Professor Sir Bernard Crick, Home Secretary David Blunkett's former university tutor