I'm not sure whether saving money for a startup is a good idea. It might just be a copout, a reason why you can't yet start your own company. But you can. You don't need that much money to incorporate, and you don't need to quit your day job - you may be able to move to a cheaper flat, keep working something like 50% at your day job, and spend the rest of your time on your startup while still making enough money for a reasonably decent living.
