A section of the GWR Penarth Dock and Tidal Harbour Track Layout Diagram of 1923 shortly after the regrouping of the railway system and the end of the TVR. The Dock Offices and Custom House are clearly labeled ; the Mercantile Dock Office is not but the Marine Hotel is! The old Marine Hotel public house is shown annexed to the end of the building. [252] [Wiltshire & Swindon Archive Ref: 2515/410/1647]

The Edinburgh Gazette stated that : 'His Majesty the KING has been pleased to award the Imperial Service Medal . . . to William Edward Vowles, Inspector, Mercantile Marine Offices, Penarth.' - Edinburgh Gazette [609] 22nd August 1922.

November 1932 - A small section of an impressive set of plans ; this GWR Plan of Facilities at Penarth Dock and the Ely Tidal Harbour is held within the archives of the National Museum of Wales at Nantgarw. It confirms that the Marine Hotel was maintained externally by the Company but that the tenant had to get his paint brush out occasionally! [629] [Museum item number : 88.81I/1-4] [20180318]