Plan? Don't be silly, this is the BCTTT!
Yeah I have a sort of plan which I never manage to stick to, even though it's only about five hours a week
I've learnt not to worry about it, and try to see my training plan of more of a rolling programme rather than X hours per week. EG the plan is a long run tonight then a tempo run on Thursday, but if for some reason I can't do tonight then Thursday will be the long run, then the next chance I have to run will be a tempo run etc.
The only fixed definite session I have is track session on a Wednesday.
When I started tri, I worried about not doing all the training I needed, now I've learnt to chill out so I'm far happier.
Occasional BCTTT messageboard loiterer.