Measure out all dry and wet ingredients
Place sugar and butter in bowl of stand mixer and beat until pale and fluffy
Add 1 egg at a time, waiting until previous is fully incorporated into mixture
Add milk and vanilla and continue to mix
Once combined, add the flour, bicarb, salt and espresso mixture
When fully mixed, fold in chopped walnuts
Pour mixture into lined and greased loaf tin and place in preheated oven at 180°C and bake for around 50 -60 minutes, checking after 50 and when skewer comes out clean
Leave to cool on rack completely
To make frosting, add very soft unsalted butter to bowl and begin to beat
Add cream cheese and beat until fully combined
Slowly add sugar and instant espresso(dissolved in a touch of milk) and continue to mix till fully incorporated – place in fridge until ready
When cake is cool, spread frosting on top of the loaf, then finish with chopped walnuts before serving