The Perfect - For - Everything Sponge Cake Recipe!

We all have that recipe we go back to time and time again, the classic, the family favourite - and here is mine! The tried and tested sponge cake.

Om nom. Disclaimer - this is not my recipe! it belongs to the Dairy Book Of Home Cookery! Pease don't sue me! Ok, onwards with the recipe!
Ingredients:
100g (4oz) butter, softened
100g (4oz) caster sugar
2 eggs
100g (4oz) self raising flour, sifted
45ml (3 tbsp) strawberry or raspberry jam
Icing sugar, sifted (optional)

1. Grease and line two 18cm (7inch) sanwich tins
2. Cream butter and sugar together (this is the part of the cake I always have a sneaky taste of -shh!), until light in colour, light in texture and fluffy.(Not literally fluffy)
3. Beat in the eggs, one at a time, adding 15ml (1 tbsp) flour with each one.
4. Gently fold in remaining flour with a spooooooon.
5. Transfer to prepared tins and smooth tops with a knife.
6. Bake at 180 (not sure how to do the degree symbol!) (350F), Mark 4 for 25 - 30 minutes, or until well risen, golden, brown and firm.
7. Leave in tins for 2 - 3 minutes. Turn out onto a wire cooling rack.
8. Strip off paper and leave until cold.
9. When cold sandwich together with jam (nooom...jam...)
10. Dust with icing sugar.

And EEEEAAAAATTT! Thankyou for virtually listening, and goodbye!