I've been in my current job for about 18 months now and keep an eye out for interesting (i.e. better) opportunities. I've just thought on how to answer if I were to be invited for interview and I was asked, "why are you leaving your current job?"
I am not desperate to leave my current job but am passively keeping my eye out for new opportunities.
I can see both positive and negative connotations that can be drawn from that but that could be said if I went the other way - that I was actively looking for a new position to further my career as there are no opportunities for progression in my current role.
So, question is, what's the best way to answer?