Went straight from online application to a 1 to 1 interview with the person in charge of all south London branches. Brief getting to know you like why did you apply, how did you get here today then about 7 competency questions.
Should last for an hour, told me after 1st competency question my answers were too short. Try to speak for 5 mins per question using STAR format.
Seemed concerned with my commute time, indicated possibility of successful candidate being placed in a branch closer to their home and that they would have a meet and greet with the actual branch manager to check culture fit as next step. Successful candidate would have been contacted within few days.
Did take a photocopy of passport but didn't check the other documents you're asked to bring to the interview.