He actually had two PA's, Izzy and the girl with the short brown hair plus Francesca who worked for Gleam and was responsible for them. Then there was a girl with long black hair, the one who went on the cruise with them and Izzy, I think. Francesca quit Gleam and the two PA's just disappeared, he moved his office down to where they used to work. The last thing Izzy did was the school's summer ball she organised on behalf of Jonathan last year, I'm guessing they're trying to save to money and there really wasn't much to do for them anymore after work dried out. Plus, they mainly used those PA's to help Jonathan in the garden or mind the kids.