Well, Chassez is right, only the odd person gets in with the national, but on the Times website it says something about the trainees rotating departments (ie home news, international news, politics etc) every few months for the first year or two, and this is probably a good way to get trained.
I would advise you to go to your career dept. as they should have a brochure of regionals doing training schemes. I have one somewhere and will try to find it and post what it says.