So, this week I have learned that I need to eat if I want to exercise. Important point, that.
I've also been experimenting with doing workouts at lunch time so I can still work out the days I want to leave work at 4 to get somewhere after work. It's not really enough - I can only manage about 25 minutes of cardio into a lunch hour once changing, showering, stretching, etc. are included, and my goal for cardio workouts is 45 minutes. It's better than nothing for those days, though, so I'm going to keep playing around to try to maximise that time for leave early days.
I've also come to the conclusion that I should at least do my cardio after weights on weight nights. I've noticed that I get a lot less out of my weight sets when I'm doing them without my trainer, mostly because I tend to tire out faster. I suspect part of this is that when I'm on my own, I have been doing cardio first. So, the new plan for weight nights is to do weights first, and then use whatever is left on cardio - some nights this may mean that I don't do as much cardio. However, the "do everything every night" plan is from when I would make at most 3 workouts a week - especially with lunchtime workouts added in, I am doing a decent job of hitting 5 per wee. I should probably be taking that into consideration when trying to figure out how to get the most out of my workouts.