I always let my Christmas cake cool at room temperature and turn it upside down as I find the weight of the cake more or less makes the slightly domed top flatten out somewhat.
I did a cake decorating course at college and we made a lot of rich fruit cakes for that and our tutor always told us to double wrap in parchment paper and then foil as the alcohol in the cake shouldn't come into contact with the cake.
ElroodFan you can in theory marzipan a cake quite soon after it's been baked and cooled but of course you lose the opportunity to 'feed' the cake. I'd recommend leaving a good few days between the marzipan and icing as it takes a few days for the marzipan to fully dry out, I always put my cake in a cardboard cake box once it's had the marzipan put on as the marzipan will seal the cake as will the coat of icing.
I'm also a fan of the Delia Smith Christmas cake.
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