I think not - I always understood that the alchohol preserves and it's a large Tesco Finest with courvoisier from the 2011 Christmas range. Found it in the back of a cupboard during an epic tidy and recalled mum gave it to me, well... in 2011.
I gleefully reported my find last night and mum's reaction was 'I'll be having the trifle then', and DH gave me the look he reserves for ' I'm not going to say anything because it will lead to an argument but if you think I'm going along with that plan you've got another think coming'.