When I've got oranges (or similar) that are just not quite nice enough to keep in the fruit bowl - I boil them up with some water and sugar, until the fruit is very soft, and make a sort of marmalade/compote. I keep this in sterilised jars and use it - either like jam, or in cakes - this is the marmalade cake version.
You can use actual bought marmalade (or apricot jam is very nice) - and it gives the sponge a very nice flavour. Keeps well too.
180 deg. C - approx. 1 - 1.1/4 hrs.
6 ozs. self-raising flour (or plain flour and 2 tsps. baking powder)
6ozs. Flora (see pic) - make sure you use the 'baking' one
3 medium eggs - lightly beaten
3 tablespoons of marmalade or compote
1/2 tsp. baking powder and a pinch of salt.
Mix all the ingredients together - dont overbeat - just till nice and smooth.
Pour into your greased or lined baking tin.
Check with a skewer (or listen in!) to see whether cooked through.
Cool - and eat!