I've recently applied for an internal post and the interview will be in two stages. I went for the first part last week and was asked why I was applying. I said that one of the things that appealed to me was that the post was part-time and that it would fit in with my current part-time hours. I also said other things about it being useful for my career and personal develpment etc.
I had feedback yesterday from one of the interviewers and they said that I have made it to the second stage but he warned me not to mention the part-time aspect because it came across as being more important than the post itself.
I thought that I was being honest and the fact that I work 3 days a week anyway would mean that it would not be an issue. I was obviously mistaken. So much for openess and an honest commitment to flexibility in the workplace.