13. The holder of a safety certificate or a safety authorisation shall, without delay, notify the Office of Rail Regulation—
(a)of any major changes—
(i)to the means by which he meets the requirements relating to the safety management system as set out in—
(aa)regulation 5(1) to (4) in relation to an operation of a transport undertaking on the mainline railway;
(bb)regulation 5(7) in relation to an operation of an infrastructure manager on the mainline railway; or
(cc)regulation 6 in relation to an operation which is not carried out on the mainline railway;
(ii)in the case of a transport undertaking, to the provisions adopted by him to meet any requirements necessary to ensure safe operation on the transport system in relation to the operation in question; or
(iii)in the case of an infrastructure manager, to the provisions adopted by him to meet any requirements that are necessary for the safe design, maintenance and operation of the infrastructure in question;
(b)when persons first commence work directly relating to the operation which is of a type which has not previously been carried out in relation to that operation; or
(c)when types of vehicle which are new to the operation in question are first introduced.