@LadyCounterblast
We ended up doing chocolate orange cupcakes because his royal highness ds decided they were better 
We just did a really simple normal sponge mix added plenty of cocoa powder and added the zest of 1 orange. Smelt great when we got them out of the oven.
Personally I would do a ganache on top and then a segment of chocolate orange but ds won't touch ganache with a 10 foot barge pole so we are going to do chocolate butter cream and pop a segment on each one. Although we did get some chocolate orange Smarties buttons as well so o am sure they'll feature too!
I'll upload a pic when they're done 