city fan,
It depends on your definition of 'programme'!
After last year's FLM, I took off 3 months from running to aim for an indoor rowing competition in July. After that, I started running again in August. I literally started with 1 mile runs, followed by 2...5...7 etc until I reached 13 miles in November. Since then, I have stuck to speed/interval/fartlek sessions in the week with a longer run on the Sunday. (I have tagged an extra mile on every 3rd/4th week, to the point where I have now completed my first 20 mile training run.) In between the 'long' sessions, my other Sunday runs would be somewhere between 5 and 10 miles at a good tempo.
It therefore could be argued that my training for the marathon started in August! For people who run all year round, they can get away with these 12 week schedules you have probably read about. It really depends on several things, such as what standard of runner you are, what your goal is and how much time you can put into your training!
Good luck with whatever you choose to do!
Safety29.