Christmas Queen of Puddings

The only things that are remotely Christmassy about this are that I use marmalade (sweetened with golden syrup) in place of the more usual jam, replace the lemon zest with orange zest (the smell of oranges, see also clementine cake, always feels Christmassy to me) and I make the crumbs (in the processor as normal) not out of bread but out of pandoro, one of those yeasty cakes (this one’s unfruited) which Italians eat in significant numbers, as we do t