Unipart Linux Engineer interview questions

Stage 1: Tech Assessment Stage 2: Informal Phone interview Stage 3: Formal interview in Cambridge - 1 hour 45 minutes I was the only attendee not wearing jeans; First 10 minutes was looking over the Tech Assessment (bit late as I would have thought they would have reviewed that a couple of stages ago). 10 minutes of going through the questions I did NOT answer as they were developer questions. I had attempted a C programming question which they went to great lengths to prove that on a linux x86 system I had answered correctly but on some older unix running RISC or other it could be different. As they attempted to ask me to remain at a whiteboard to go through another C question I halted the interview and sat down. Not being schoolboy age any longer I thought it wrong that I was being treated like one, though I held my tongue (mostly) and pointed out that I was not continuing in this way (I knew then this was not the place for me). I was then asked in depth networking questions that had so far not needed to be known by me for 23 years of being a linux sysadmin. The interview continued with noting I was APMG certified but they did not think Agile really worked. This led on to be told the role was for Regulatory Compliance and programming - maybe I could be trained to be a coder and debug their own developers' code when it didn't work? At 1 hour and 30 minutes I effectively ended the process when I asked the question if they had any linux servers. The response was yes, many, why do you ask? The reason was because in 1 hour 30 minutes they hadn't mentioned it or asked me about anything linux. Quite strange for an interview for a linux engineer.