Jo - i'm not saying , do or dont - but i think you should consider ( most of whats written above ) the runners are the only people who can advise you - Firstly - those who have completed marathons, and then - those who have not - to a degree - , but have tried say 20 miles and found its not for them - will be able to tell you how they feel or felt on thier way to the distance - for 2013 - there's 11 weeks to go - there's massive obstacles in your way - Marathons for a start are all on the day - even the worlds best or highly expereinced runners can come apart - it then takes decisions on route as to what do i do ?? - some of those decisions we get wrong and can be heart breaking even for us
ok, your only out to finish, your on two miles ?? - you wont even know at that distance if you have the correct footwear for example, or if your going to blister badly or anything - chaffing -
your body will need to adjust, you may find pain in training on route, your body will need rest and re fuelling
you'll be on your feet all day, i'm not talking walking around the office all day- i 'm talking walking, running, streching out going into virtual no mans land - you wont even have the physcological strategy or mental stamina to use - as there's been no time to develop it
consider - if you leave it for this time as said, you'll get over it, - if you get into the race on the day, and have to stop becuase of what ever, ( pain - like uve never imagined) you'll have a broken heart as many do
as usual ther entries for London have gone in, by many with little or no idea what their letting themselves in for - some will never run again - some will but never marathon distance
my advice to you is to train when ever you can until end March - then see where you are in every aspect - but its not just about physical miles -
seriously, take care in life & good luck
Mick