Quick google search for '3xb bedford paint code' brings this page:
http://www.buga.com.au/index.php?option ... pic=1699.0 where halfway down it seems to suggest the colour code on 80-84 is called "Cargo Beige".
Another source would be handy as I'm confused by that list suggesting both 6RD and 9RD are 'Cargo Red', when 6RD (for 1976 at least) on Vauxhall was Extra Dark Wine. Unless Vauxhall codes are not the same as Bedford codes, a situation you'd think anyone sensible would avoid even back then.