C.
Token Bird is right - we are only having this discussion because earlier wannabes have been naive and/or desperate enough to stump up for their own TR. And if airlines are given the chance to pass £20k of training costs back to the applicant, it's hardly surprising if it sets a dangerous precedent.
What next - paying for your own uniform? medicals? drinking water? Oh, hang on - that already happens. I wonder why . . .