Mix the butter and sugar. Add the egg. Mix well. Sift the dry ingredients together and add to the mixture, gradually adding the milk.
Pour into a greased oven dish.
Bake for 40 minutes.
In a sauce pan, melt the butter and bovril.
When the cake is removed from the oven, prick the cake with a fork to make even holes. Pour the bovril mixture over. Sprinkle with the cheese, the heat from the cake will melt the cheese.