Well dear former employer thank you for everything. Thanks for taking me on as a junior and not providing any training at all. Thanks for changing my job role without consulting me whilst I was on holiday and again failing to train me for a job I had no idea about, but you apparently needed me to do for you. And finally thank you for letting me work nearly a full shift before telling me how much you like me, don't have a bad word to say about me, and you're really happy with all my work but the company and I "aren't a very good fit for each other anymore".