The recipe from the OP may be off. Here’s another BBC website from the same BBC Bake-off Mary Berry Victoria Sponge, but it calls for 2 tsps of baking powder, not 1.
The recipe from the OP may be off. Here’s another BBC website from the same BBC Bake-off Mary Berry Victoria Sponge, but it calls for 2 tsps of baking powder, not 1.