Medfits ADB459046 and ADB461123 were used as match trucks from 1970 to 1980. Lowfits ADB452339, ADB452604, ADB452732, ADB453241 and ADB453255 were used from 1980. Some photos. http://www.flickr.com/photos/brianews/6022764883/
http://www.flickr.com/photos/74009/4263247785/
http://paulbartlett.zenfolio.com/paulbartlettsrailwaywagonphotographs/h1AE59520
http://paulbartlett.zenfolio.com/paulbartlettsrailwaywagonphotographs/h16118F79
http://daverowland.smugmug.com/RAILWAYS/BR-1983-2003-Location/Portsmouth-Fareham/i-SLwTwD6/0/L/4342-W%26CityMatchTruckADB452604-483004-124-Fratton-L.jpg
The boxes were for carrying brake hoses. 452604 later had the box removed and became a W&C stores carrier.
Cheers David