I don't think I'll be able to do this race again this year, which is a shame, but having run it last year I would definitely recommend it as it was a very nice course (with a few inclines - including one near the finish) and a very friendly atmosphere.
I've nothing to add to the original discussion but just wanted to say that I did enjoy reading about someone who has posted with a specific aim and has actually come back to the thread to say what they did and how it affected their performance! Too many people seem to ask very sensible questions, get people keen to give them useful answers ...then are never heard of again! Very well done, RM6, and keep up the updates!
Reading this thread I am getting the impression that those for whom Po10/RunBritain are the be-all-and-end-all are the minority. These rankings certainly don't feature on my radar when I pick races to do. Echoing Tom77 and Millsy above, it's more important to me that the race is well organised and that I get a result for that race itself (bit wary of "fun runs" that don't publish results, or sometimes just not very meaningful results). I keep track of my own results (times, positions, etc), and just don't feel the need to have a website compare my performance to other people's. Until there is one HUGE database of every race that every runner in every corner of the country has done, surely these sites are not real representations of comparison, given that (for example) someone might have bettered your time in race that, despite being accurately measured and meeting all the criteria, etc, isn't listed on one of these sites. What does that mean to you for your time?!. What do people get out of them, except a niche version of seeing your name in lights?! I don't mean to belittle these sites but I just don't know what the great appeal is.