Thanks for the welcome.
In the feedback over 25 years, I remember one visitor saying that they had boiled up a pudding that was over 7 years old. It had been stored in Muslin and hung on a hook in a larder.
The Pudding will keep very well, and could have easily been kept in a cool larder. See my website for my recipe, and LOTS of feedback from Christmas pudding experts & Pudding first-timers!
(25 year hobby site, no ads, just...