I've had a bit of a mare preparing for this. I fractured my fibula at the beginning of June so training went into reverse for a couple of months , ever since then i've been playing catch up and unfortunately my rickety old body has really struggled.
I've currently got what appears to be hip bursitis and have been trying to shake it since early November. I had a groin (adductor?) strain just prior to it and unfortuantely it seems I didnt stop soon enough, I can only assume this has cause irritation and inflammation in the surrounding area, ie, the hip 
I've not been to the physio as quite simply, money is tight. I'm currently not running but walking couple of miles every other day with a 6 mile walk at the weekend. Sad i know but I have to at least keep moving!
At the moment the plan is to walk / run the Donald HM and take it from there. Times are absolutely off the radar, i would just like to get round any way I can. If that means run / walking and taking 7 hours, then if possible i'll do it. However, to do this I need to be pain free after the HM.
Not quite as I planned it but hey ho, got a family holiday to look forward to and hopefully will be able to at least take some part in the marathon weekend.