Don't be daft, I aint no expert!
Madeira cakes tend to be for carving. The all-in-one sponge can withstand ready to roll icing. However, I have a madeira cake recipe here:
10 oz SR Flour
20 oz Plain Flour
24 oz Caster Sugar
24 oz Butter
12 large eggs
3-6 fl oz Milk
4 Tablespoons Vanilla Extract
Cream the butter until smooth, add the caster sugar and beat to smooth and creamy. Add the eggs two at a time, with a few spoons of flour; finally add the vanilla extract and milk. Add the milk slowly, till you have a nice smooth consistency (not too dry not too loose). Pour the mixture into your cake tin, filling it to the top of the tin. Make sure your lining comes about 2" above the tin. Spoon a ‘well’ into the centre of the mixture in the tin. Bake the cake in the centre of the oven for 2hr 30 mins, if the cake looks well risen and brown you can do the ‘skewer test’ - when your skewer comes out clean, your cake is ready. However if the skewer is not clean, but has cake mix on it, leave it to continue cooking, check again every 15 minutes.