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All of your gains will come as a side effect of: Running
Fair point.
I was looking at some of the trainingpeaks training plans you can buy for about $100, and a pal is using one atm, but it doesn’t seem too much more interactive than just taking a free plan and saving the cash, plus I’ve a few big swimming races planned as my secondary focus for the year so don’t want to limit my swim time to 1-2 days a week like almost every plan suggests.
Thanks @Retro_Bastard, might pick up a copy for the bookshelf, and @Tallboy will take a look!
Time crunched:
Your swimming is good already, so don't bother swim training. The marginal gain from improved swim time is not worth the training cost. Do some kitchen / bath transitions, taking your wet wetsuit off.
Cycling: stick with the commute, or a weekly longish ride* - All of your gains will come as a side effect of:
Running: focus on run training. Find a half marathon / full marathon plan that fits your schedule.
* make them brick sessions as your training volume increases.