Well I am in training for cabin crew with Britannia at the moment. And I can tell you, that they are the best airline to go for first time. The trainers are great and as you would like to be a pilot, you can get experience on working on three different aircraft. It really is fun!!!
As for the easyjet and ryainair thing. I think Ryanair only take up people from a certain agency. And I don't think applying to easyjet is such a good idea at the moment, they are REALLY difficult to get into, and they require a lot from you. And yes, you have to pay for training with Ryainair and you have to pay for thaat horrible orange uniform at easyjet.
So I think your best bet, is to go for Britannia!!
Good Luck!!