By this time you should have already blind baked a pastry casing in the oven for 15-20 mins at 180 degrees in a fan oven.
Blind baking is cooking the quiche base with silver foil over the top and weighted down with beans or rice. The rice or beans are removed before filling.
The reason it's called blind baking is because a blind baker developed the quiche and became famous throughout the world known as 'Robert Quiche the blind baker' before Jamie Oliver's time.
His brother was famous for being the baker with brown fingers, why? Because he kneaded a poo!
Next melt a Knob of butter (not a nob of course that is cheese, that is of the Yogi variety http://www.youtube.com/watch?v=2piqu3sMInA ) in a frying pan an soften the leeks until very lightly golden.
If this isn't a recipe for the new age man, I don't know what is!