I made my Christmas pudding a few weeks ago. I checked one of them last night, only to find mildew has formed on the top. What can I do. I have already given one to my sister, so I am mortified.
Your sister's pudding may not have gone mouldy, ask her to check.
There is still time to make more Christmas pudding, make sure you put enough sugar in and that it is totally dry and cool before you wrap it for storing
What a shame, but you are best to remake them as they will be mouldy througout. Its not quite the same as scrapping a thin layer of mould off the top of jam. They have sweated in their storage and gone off.