Taken from another forum, but I've confirmed it's 100% true! 8-)
"The B&Q kingfisher one with 5 companies listed including MVC were issued when Woolworths were still owned by the kingfisher group. B&Q will take them.
If its just got comet, B&Q and woolworth they were issued by woolworth under lience after they left the kingfisher group so wont be accepted. For reference."