Thanks everyone, it’s not a flavour request I’ve had before!
Thanks Yum Cakes and Treats I think your suggestion is probably the easiest and best option.
Swasen I am with you on the whole artificial vanilla flavour can’t stand it myself, even my son’s hate it. I would have to adapt it and just crush the biscuits into the buttercream.
Lou thanks for the link, mud cake idea sounds like the plan I think. They haven’t booked yet so not stressing just yet!
Simply Alpa