UK Family Law Reform

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http://www.cps.gov.uk/legal/s_to_u/sentencing_manual/perjury/index.html

perjury is committed when:-

a lawfully sworn witness or interpreter
in judicial proceedings
wilfully makes a false statement
which he knows to be false or does not believe to be true, and
which is material in the proceedings.
The offence is triable only on indictment and carries a maximum penalty of seven years' imprisonment and/or a fine.

A conviction cannot be obtained solely on the evidence of a single witness as to the falsity of any statement. There must, by virtue of section 13 Perjury Act 1991, be some other evidence of the falsity of the statement, for example, a letter or account written by the defendant contradicting his sworn evidence is sufficient if supported by a single witness.

http://www.ukfamilylawreform.co.uk/court.htm