(1) Regulations may modify this Part in its application in the case of -

(a) persons employed in any of the employments specified in paragraphs 2, 3, 4, 5, 9 and 10 of Part 1 of Schedule 1, or

(b) in the cases that may be prescribed, persons employed in eircom plc, or

(c) in such cases as may be prescribed, persons who, on 5 April 1995 were employed in an employment to which paragraph (a) or (b) applies and which is prescribed, and who cease to be so employed, but immediately on such cessation become employed in another employment which is prescribed, under terms and conditions which provide that the person continues to be employed in a permanent and pensionable capacity and for payment during illness on a basis considered adequate by the Minister, or

(d) persons employed in a statutory transport undertaking, or