You have a great start at a successful marathon. Many runners are like you (and me) and prefer treadmills during the coldest and hottest seasons. That can be a major part of your training. Weight training for muscles, joints, and flexibility is excellent (I do leg presses, leg curls, and leg extensions, as well as vanity things for the rest of my body.)
There are two inviolate rules that you must heed. One, make at least 3 long runs of at least 20 miles each. Two, do nothing new on race day. This means that starting in March you have to make some long runs on London surfaces, not on treadmills. It means that on one of those runs, you must wear the exact shoes, socks, tights, shorts, synthetic jersey, wind suit, bandaides, lubricants, nipple guards, timing chip, water pack, fanny pack, back pack, lap watch, sunglasses, hat, etc. that you intend to wear at the April race. Try to do without the water packs, fanny pack, back pack, and second layers.
Ollie and Bambi may disagree, but I would say get out and run even when you are lethargic. However, if after a quarter mile or so you haven't begun to enjoy the run, then head back to the locker run and try again another day. You will want to exceed 50 miles per week during March, provided you can do this without injury.
Now for the long run. You can run any course from a quarter-mile track to a 20-mile loop. I run multiple 3-mile loops around a small military airport. It has some isolated woods if I need to leave the loop temporarily. I pack an ice chest in my car with my choice of sports drink, power bars, and gu. Every loop, I stop at my car for hydration as if it were a water station. If you can do the same somewhere in London, about April 1, making a 20+ mile run with your marathon clothes and your marathon's drink and food, you will do fine at your first marathon.
Be sure to post your review of the London Marathon after you run it.
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