Which supermarket for the best chocolate fudge cake?

[stirling]

Because I don't think I have the energy to bake one this year.
Any recs? She really loves a good chocolate cake with choc buttercream icing...
I do find M&S cakes a bit sickly...
Thank you

[DeadButDelicious]

The coop do a lovely one. Not too sickly, nice sponge.

[stirling]

Oh wow, thank you!

[mistermagpie]

I don't like chocolate cake, but the M&S one with the chocolate curls round the side is amazing!