I really love this colour, I totally forgot that I even had it.
Its nameless unfortunately, but it is the most beautiful minty/aqua/turquiose colour which at the moment is my favourite.
It came in a set of four pastel colours, I love the pinky/lilac colour and have been wearing that to work recently and have received so many compliments on it- post to come!
Marks and Spencers isn't somewhere you would really think to go for things like nail polish, but honestly they have the nicest colours and they are so affordable so I really recommend that you have a look if you haven't already.
xx