one2escape, great job with the 10, as kenneth says, its more about time on the feet, so its excellent to be getting 10 done now, again just increase by 1 or so miles per week, nothing too fast and it should help keep injury away!
saying that, im on a week of rest myself due to IT band issue, plaguing me since the start of january when i ramped the miles up a bit, finally went to physio and told to rest a week and stretch surrounding muscles etc...looks like itll be over a week too with the snow
tough running conditions at the weekend, priority for me was to avoid slipping and injury! Got 7 easy miles on Saturday and 9 yesterday for VLM training, got me 29 miles for the week so building up gradually and feeling quite good at the moment - mid march will be a different story!
one2escape - speaking from experience, id definitely agree with martin on this one, if you're set on doing it, use something similar to the hal higdon novice 1 plan - i did a similar thing for my first marathon - decided after new year to run a marathon in 2010, having only run a maximum of 5 miles (previous years relay) before and followed the hal higdon plan - its crucial to follow the advice on long runs and not running too fast during them - injury permitting, 16 weeks should be time enough - good luck with it!