55.—(1) Subject to the requirements in Part 1 of Schedule 9 in relation to carriage by road or Part 2 of that Schedule in relation to carriage by rail, where dangerous goods are being carried by—
(a)road or by rail in tanks or in bulk and, in the case of carriage by road, on a transport unit registered in Great Britain; or
(b)rail in piggyback transport,
and the whole of that carriage operation takes place in Great Britain, the loader, filler, consignor and carrier shall comply with the requirements in regulation 20(3) relating to placards, marks or plate markings.
(2) Where in relation to carriage by rail, the loader, filler, consignor and carrier comply with the requirements in Part 2 of Schedule 9, then regulation 20(4) and sub-section 5.4.1.1.1(j) of RID shall apply as if they required the EAC to be entered in the transport document instead of the HIN.