Deciding which training to choose

Hi wondering if anyone can help? I'm running the London Marathon in 2017. I have been running a year and completed a few 10K's 10mile (in 2 hours 1) and a half marathon (in 2 hours 50). I'm slow and really want to improve my time for the marathon but I think I'm in a habit of running slow. I want to start marathon training this week but don't know whether to pick the beginners or improvers training plan from the marathon site. What would you advise?


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