Base yourself in a youth hostel somewhere nice (Lake District, Scottish Highlands, Brecon Beacons) and arm yourself with a book of walks/runs. You can probably also get suggestions from the wardens or other visitors. You can keep the costs down by self catering, and they'll have drying rooms and be used to catering for outdoor types. If you're planning on running on your own though, make a point of telling people where you're going and when you plan to get back.
Pancake - you're well ahead of many people if you've already done an 18 miler. Believe me, there will be people who won't have run that far by race day. Training is all about consistency, so pick a plan that you think you can stick to, and one that realistically fits into your life. When it comes down to it, most are based around one long slow run a week, one faster session and some other medium pace/distance runs or cross training in between to build up stamina.
And there are advantages to being a female vet - often there aren't many of us in the category and it's possible to place quite high
Hello all. Welcome to the new people - you've picked a great race. Stick with us and you'll have a ready made support crew/band of accomplices/sounding board for random running and non-running related musings. I won't be running this year, but will be climbing back into my minion suit and shouting at you all at km 41.
List fairy - can you add me to the list for Comrades - thanks.