Parliament of the United Kingdom

“ A person who without reasonable excuse obstructs or hinders another while that other person is, in a capacity mentioned in subsection (2) below, responding to emergency circumstances, commits an offence. ”

“ The Secretary of State shall not make an order under subsection (1) above unless it appears to him that the person to be added (or, as the case may be, each person of the description to be added) is one whose functions or activities are such that the person is likely, in the course of carrying them out, to have to deal with emergency circumstances.
(3) Before making an order under subsection (1) above which relates to Wales the Secretary of State must consult the National Assembly for Wales. ”

“ For the purposes of sections 1 and 2 of this Act, circumstances to which a person is responding are to be taken to be emergency circumstances if the person believes and has reasonable grounds for believing they are or may be emergency circumstances. ”