30Excluded employments
(1)Parts I and II do not apply to employment where under his contract the person employed ordinarily works outside Great Britain.
(2)For the purposes of subsection (1) a person employed to work on board a ship registered in the United Kingdom (not being a ship registered at a port outside Great Britain) shall, unless—
(a)the employment is wholly outside Great Britain, or
(b)he is not ordinarily resident in Great Britain,
be regarded as a person who under his contract ordinarily works in Great Britain.
(3)Parts I and II do not, however, apply to a person employed under a crew agreement within the meaning of the [1970 c. 36.] Merchant Shipping Act 1970.