Some of you may be

Some of you may be aware that I’m a bit of a fan of Cook, the purveyors of the finest gourmet ready-prepared foods. It seems that Marks and Spencer are going to launch a range of similar products under the range name "Cook", much to the annoyance of the proprietors of Cook, particularly as they have no links with M&S and will not be supplying the meals.
It seems from their website (and notice in the window of their Chichester store) that they do not plan to fight this. Surely there must be some grounds on which they can stop it? Do they own the copyright in the name "Cook" when used to brand gourmet ready meals?