By coincidence I made this lemon pudding recently for visitors, and although, like Rosebud, I long ago gave up making sad cakes (with the exception of large square solid fruit cakes that cannot go wrong) it worked beautifully and is truly delicious, and I guarantee that if I can make it, anyone can...... I agree that there is something incredibly light about the sponge topping. I have made it lots of times in the past, a winner every time.
I testify that if you cook it for too long, you lose the liquid lemony sauce at the bottom, but even then it is very good indeed!