Section 137: Permitting escape

Any person who, being an officer of a prison, or a member of a police force, wilfully
permits any other person within his lawful custody to escape‐
(a) is, if such last‐named person is charged with an offence punishable by death, or
penal servitude or imprisonment for life, guilty of a felony and is liable to imprisonment
for seven years; and
(b) is, in any other case, guilty of a felony and is liable to imprisonment for three years.