Initial informal introductory call followed by several formal meetings and then a powerpoint presentation covering past experience, followed by Question and answer and then followed by 1-1 meetings with more colleagues etc.

Redrock Consulting put me forward. Over a fortnight later I have the feedback which along with my reply I feel like copying and pasting here. In a nutshell they have changed the interview process and handed over the hiring role to someone else who never interviewed me but felt according to their notes I wasn't the fit. If I could upload the email or copy paste it I would.