Here’s the log wrapped up tightly in greaseproof paper ready for the fridge overnight. I made the buttercream on the morning of the day it would be served:
Of course, the proof of the log is in the eating and I can personally vouch for the deliciousness of this slice:
Sources: Perfect Cakes by Nick Malgieri and The Williams-Sonoma Collection: Dessert Serves 12. Cake should be stored in a cool, dry place. Leftovers should be refrigerated.
NB. I made a chocolate buttercream instead. This meant I omitted the coffee and rum and replaced by 200g melted chocolate – I used Green & Blacks milk chocolate and it was delicious!