Non-Fatal Offences Against the Person Act 1997
2.— (1) A person shall be guilty of the offence of assault who, without lawful excuse, intentionally or recklessly—
( a) directly or indirectly applies force to or causes an impact on the body of another, or
( b) causes another to believe on reasonable grounds that he or she is likely immediately to be subjected to any such force or impact,
without the consent of the other.
(2) In subsection ( 1) ( a), “ force” includes—
( a) application of heat, light, electric current, noise or any other form of energy, and
( b) application of matter in solid liquid or gaseous form.
(3) No such offence is committed if the force or impact, not being intended or likely to cause injury, is in the circumstances such as is generally acceptable in the ordinary conduct of daily life and the defendant does not know or believe that it is in fact unacceptable to the other person.
(4) A person guilty of an offence under this section shall be liable on summary conviction to a fine not exceeding £1,500 or to imprisonment for a term not exceeding 6 months or to both.