I have the following references listed for BR and pre-nationalisation ferry stock; I hope that the information is useful.
John Isherwood, Cambridge Custom Transfers (UK).
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BR Diagram 1/055 FERRY OPEN - SD-2/92;RSR3-P78;BRW-F10;HBW1-PL4,99,F21;RAIL-51;BR7-PL81(CONVERSION);BR9-PL39;WW2-P82;
1/092 FERRY CAR TRANSPORTER - BRW-F14;MRAIL-11/99;WW2-P86;
1/227 FERRY VAN - RSR2-P62,82;RAIL-11/84;BRW-F31;MRCA-85;MRC-6/63;SD-2/92;WW1-P53;MRN-10/62,9/68;BR11-FRONT COVER,PL65,121,122;WW3-P47;
1/291 FERRY VAN - BPRS-P39;SD-2,7/92;RSR2-P62;RAIL-11/84;BT-6/6;BR11-PL120;WW3-P46;
1/292 FERRY VAN - BPRS-P39;RAIL-3/85;SD-7/92;BR11-PL119;
1/300 FERRY LATEX TANKER (HENRY DIAPER) - MRC-5/84;BRW-PL71;POFW-P47;BR14-PL44;
1/304 FERRY CHEMICAL TANKER (PETROCHEMICALS LTD) - MRCA-85;MRC-11/84;
1/305 FERRY CHEMICAL TANKER (TRAFFIC SERVICES) - MRC-6/60,3/83;SD-2/92;MR-10/90;MRN-6/60;BR4-P73;BRW-PL73;BRM-5/00;BR14-PL49;
1/354 FERRY CATTLE (Ex 1/352 & 1/353) -
4MMW2;BRW-F42;BWC-P88;BRM-7/00;
1/449 FERRY TUBE OPEN - HBW1-PL138,F32;BR1-P58;
2/247 FERRY MACHINERY WELL - BRSW-P56;
2/254 FERRY MACHINERY WELL - MRCA-85;
SR Diagram 1387 FERRY OPEN (Ex Dia.1379) - MRC-2/72;HSW4-PL29,30,F12;
1388 FERRY OPEN - HSW4-PL31,32,F13;
1430 FERRY VAN (Ex Dia.1428) - MRC-12/65;HSW4-FRONTISPIECE,PL69,F29;
Abbreviations :-
BR1 (etc) - RAILWAYS IN PROFILE No.1 (etc) (CHEONA) BRM - BRITISH RAILWAY MODELLING MAGAZINE BRPS - BRITISH RAILWAYS PARCELS ROLLING STOCK (BRADFORD BARTON) BRSW - BRITISH RAILWAYS STANDARD WAGONS (BRADFORD BARTON) BRW - BRITISH RAILWAYS WAGONS (DAVID & CHARLES) BT - BACK TRACK MAGAZINE BWC - BRITISH RAILWAY GOODS WAGONS IN COLOUR (MIDLAND) HBW1 - HISTORY OF BR WAGONS VOLUME 1 (OPC) HSW4 - AN ILLUSTRATED HISTORY OF SOUTHERN WAGONS VOLUME 4 (OPC) MR - MODEL RAILWAYS MAGAZINE MRAIL - MODEL RAIL MAGAZINE MRC - MODEL RAILWAY CONSTRUCTOR MAGAZINE MRCA - MODEL RAILWAY CONSTRUCTOR ANNUAL (year) (IAN ALLAN) MRN - MODEL RAILWAY NEWS MAGAZINE POFW - PRIVATE OWNER FREIGHT WAGONS (BRADFORD BARTON) RAIL - RAIL MAGAZINE RSR1 (etc) - ROLLING STOCK RECOGNITION VOLUME 1 (etc)(IAN ALLAN) SD - STEAM DAYS MAGAZINE WW1 (etc) - WORKING WAGONS VOLUME 1 (etc) (SANTONA)