Where can I get a great choc fudge cake from?

[slipperypenguin]

Going to DSIL for Christmas dinner. We have been asked to bring along the dessert (a chocolate fudge cake).

Where can we get a good one from? Looking for something a little bit nicer than the £1 iceland number 😄

Not a fudge cake but M&S chocolate yule log is delicious!

Needs to be a fudge cake (that can be heated up the way you get in a restaurant) and not a Yule log/caterpillar.

I saw a really nice golden chocolate fudge yule log in Morrisons today.