Hi Khanivore, i too ran Gosport yesterday in a similar time / pace to you and will be running the VLM in April 2013, so maybe we can share plans here?
I'm looking to find a decent 16 week training plan for the Marathon and am using a few Halfs to measure my fitness. I've done 3 halfs this year and I've got halfs in Portsmouth in Feb and Reading in March.
I'll look at the Shades plan too along with the FIRST program.
I'd like to do London in sub 4 hours, and I'm unsure if this is possible, I want to primarily enjoy it, but I know I'll enjoy it more if I can do sub 4 hours and not really struggle.
Tim