5.  In regulation 21 (other special cases)—

(a) in paragraph (a) after “his place of work and place of residence are distant from one another” insert “, including cases where the worker is employed in offshore work,”;

(b) in sub-paragraph (c)(i) after “hospitals or similar establishments” insert “(including the activities of doctors in training)”;

(c) after sub-paragraph (c)(vii) add the following—

“(viii) the carriage of passengers on regular urban transport services;”; and

(d) after paragraph (e) add the following paragraph—

“(f) where the worker works in railway transport and—

(i) his activities are intermittent;

(ii) he spends his working time on board trains; or

(iii) his activities are linked to transport timetables and to ensuring the continuity and regularity of traffic.”.