The one I use is similar to MOS recipe but here it is.
It is a Mary Berry recipe.
10oz SR flour
3 tabs cocoa powder
1 and 1/2 tsp bicarbonate of soda
1 and 1/2 tsp baking powder
7 and 1/2oz caster sugar
3 tablespoons golden syrup
8 fl oz sunflower oil
8 fl oz milk
Sift the dry ingredients together.
Whack in the wet ones and divide between 3 straight edge 8 - 9 in sandwich tins.
Bake at 160C or 140C fan oven for about 35 mins.
Sandwich the layers with chocolate butter cream. or whipped double cream and cover with melted chocolate.