If you prefer a more generous glaze, you can double the amount of icing sugar and lemon juice.
Granulated sugar can be substituted with castor sugar.
Sour cream contributes to the fine crumb and delightful flavor of this loaf, so I wouldn't recommend a substitute.
While vanilla essence can be added for extra flavor, it's not necessary in this recipe.
The size of the loaf pan affects the rise of the cake; using a slightly larger pan may result in less rise due to batter spreading out more.