It's an interesting case and one I'll be following.
But im not sure why M&S are onlybsuing Aldi and not other supermarkets.
I remember reading years ago an article about copyrights and what happens when the product becomes too popular. Essentially it said that once a product name becomes so popular that its used in everyday parlance, the copyright become obsolete, so to speak.
For example, sellotape, Blue tack, hoover. These are all copyrighted names, but we use them for all products. I think it was hoover who tried to sue someone for using "hoover" instead of vacuum cleaner, but lost because "hoover " has become part of language and now the copyright is kind of worthless.
It'll be interesting to see if this sane logic applies to Colin.