yup, bit hilly, as Chunky says, but what goes up etc. and none of them is a walker, can all be shuffled up with not much of a problem (did a 1:47 last year as an indicator of my standard, i.e. old and slow!)
Initial reaction to your post - you'll be swept if there's a sweeper. Looking into your event that's not going to happen; you can take the full 24 hours if you like!
I did the Spitfire Scramble recently, a 24 hour event, and some "runners" did a 100+ miles, so your target is definitely doable.
Although we're all different, and you don't say what level of runner you were 2 years ago, I very much doubt you will be able to even jog 100K and so will echo Millsy's advice - Walk, jog a bit, but you main problems will be maintaining energy and mental stamina - so practice a few long "runs"
I'm not a fan of training plans, stick to foods/drinks that won't upset you stomach, make sure you take plenty of rest stops, and, if at all possible, have a back up crew to meet you at certain points with your food/drink/encouragment - it makes a world of difference on an ultra if you know someones waiting 5miles ahead!
and just to throw another spanner in the sea of logic... following up from literatin's point re fast older runners.
Surely if an over 60 wins a race outright, not as impossible a hypothesis as it might seem, (check out peter butler on powerof10, he ran a 77HM this year!), then...
Should he/she not be given all the prizes, 1st over all, 1st senior and 1st in every age group up to the 70, if there is one? After all, by Mr puffys's logic, if all the younger runners were beaten by an over 60 they don't deserve a prize!
All of which brings me back to my original premise, isn't one runner, one prize a "fairer" system?
In todays Buntingford 10M, winner, plus a couple of other categories got two identical (from where I was standing in the crowd) shiny cups.
As i said at start of thread, not really a personal problem for likes of me, purely academic, and yes, "a race is a race" but if you have different categories..... why do 1st 3 also qualify for a prize in their age category?
Just a thought, but I've noticed at a couple of races lately that some runners are picking up two trophies in the same event, typically the overall winner may also be getting the first over 35 prize, and so on over the various categories.
Other organisers have a policy of one runner, one prize, which seems to me a fairer system and spreads the rewards more down through the field.
Any other views out there? or am I alone on this one.
And no, this will probably never affect me personally, I rarely if ever am anywhere near the winners in any age group!