I am aware that it's more polite to give your employer notice in person, however the office I work in is not the same as my Line Manager. In order to give notice in person I would have to travel some hours during working hours at the companies expense. As such I have decided to give my notice via a phone call, after which I will email my resignation letter.
My Line manager has themselves arranged a phone call with me, so I will tell them during this call. However, I am aware that my LM is fully expecting this call to be about work that I have and will do, and even possible plans for the future. With this in mind I feel I should start the conversation with my resignation, so that they're not talking about plans a couple months down the line. I'm also aware that my resignation will be unexpected and throw off what they had planned (such as future plans).
Since my LM is expecting this to be a catch up call about my work I'm not sure how to bring up the fact that I'm resigning (with proper notice) in a friendly way. Basically, after the initial Hello's, how do I tell my LM I'm resigning in a friendly matter before they start talking about my work?
I'm asking this on IPS and not Workplace because I'm asking how to approach a topic.
If it helps I'm from the UK and I already have another job lined up. There are no hard feelings at my current place of employment, I get on with my co workers and even my LM. I've just found a job that better suits my needs.