I kind of feel like I am already past the event horizon on this and am tumbling straight into the 'HAVE GOT TO DO THIS' big black hole
Well in that case...You've already received some great advice from people that have actually done this race. I have not. But I have ridden solo to the south of Spain, competed in the highland trail race and cycle toured around Eastern Europe. I hear your concerns about personal safety. I also get that feeling of anxiety when traveling alone, especially when wild camping in a foreign land, but it usually passes after the first couple of nights and I settle in to the task at hand and realize that my fear far outweighs the actually risk. The biggest real anxiety for me when heading south in August is the temperature and availability of water. What I did learn from those rides is that being comfortable and familiar with using your equipment
(especially your sleeping kit) makes a big difference to stress levels and therefore your overall speed. You could use PBP as a nice early test ride in that regard, and your approach to the Cambrian 8a looked good to me when I saw you last year. Maybe a good September solo ride would be to audax LEJOG?
You may have noticed that there is a TCR page on Facebook, which can have useful snippets of wisdom. Also check out
http://www.bikepacking.net/forum/ultra-racing for general ultra racing chat in the build up to this years various races including the
http://tourdivide.org/ (there's another one for you, I can only think of one UK Female who has ridden that) and the
http://www.transambikerace.com/ among others. Lot's of people on there with lots of experience including a good number of women. Also, look out for a UK showing of this film
http://www.inspiredtoride.it/ im sure Mike Hall will arrange one or two as it is sure to attract like minded folk. I might see if we can arrange a showing in Brum by the guys that made
http://bicyclethefilm.com/.
And yes, I also hope to ride the TCR next year, if my kids and personal finances allow it
Anyone else fancy the idea of a 'UK Round Race' of similar nature to the TCR and transambikerace but kind of like an x-rated perm so you have to collect prof of passage. Controls at Canterbury, Norwich, Berwick, Thurso, Ullapool, Oban, Stranraer, Windemere, llanberis, llandovery, Barnstable, Penzance, Plymouth, Chichister, Canterbury.
http://goo.gl/maps/HkFRS approx 2,200 mi so possible in under 10 days for some.