It's ok i found the Ultimate plan...can't get into it mind as its in subscribers bit though!! Have you got it on excel or like?
If that plan is working for you then i would definatly not look to change it, maybe tweak it but we'll see.
Another question do you record your runs anywhere/use a garmin or alike, which will show splits/pace.
As Meldy has pointed out i'm running Brighton as well, havent concentrated on marathons for a few years but do have a best of 3.15, hoping to get around 3.45 this year...like you i hate it being warm, would much rather run in a minus 20 blizzard.
Of to work for me...catch up with you soon