I applied online. The process took 2 months. I interviewed at Transport for London (Londres, Inglaterra) in Aug 2014
Interview
Pre work - presentation the subject was provided by them and comp/experience interview. They provided supporting information for the presentation. Which didn't make sense and In fact was a hinderance rather than a help. Arranging the interview after a long delay was good and they were quick to go to offer.
Interview questions [1]
Question 1
All technical and experience based. Didn't ask what I knew about the company, but did ask my opinions. So make sure you have some but be careful how you position them. They do not welcome opposing views.