543In section 155(1) (changes in the persons carrying on qualifying activity) for paragraph (b) substitute—
“(b)the only changes in the persons carrying on the qualifying activity since the shipowner carried it on are changes—
(i)which do not involve all of the persons carrying it on before the changes permanently ceasing to carry it on, or
(ii)in respect of which the qualifying activity is treated as continuing under section 343(2) of ICTA.”