A phone interview with the hiring manager, followed by a face to face interview with the hiring manager then face to face with one or more senior people from Operations and/or other areas of IT. Finally, an interview with HR. If successful, HR & the agency negotiate - HR are given salary limits and Office Title limits by the Hiring Manager or their Manager. Offer is typically take it or leave it - there is no further negotiation at this stage.

I was referred in by a friend to the hiring manager. Had several rounds of interview with IT (in-person, video conf with London), with the business and with HR.