Thanks Cat, just sent mine off with D, bit of a fraught time trying to find a PE kit this morning, not that we leave everything to the 11th hour you understand 
What do I think? From meeting you and what I know of you this far I think it's a good idea. It's specificity in training and also focus in the quality of training as opposed to the mantra that more is better. I do believe and always have that consistant training is the golden ticket as opposed to just throwing out distance, usually at slow speeds.
A very good friend of mine and athletics coach (coached the winner of one of the big USA marathons in days gone by) chats to me regularly about all this as I'm constantly tapping him for really kk specific ways to pb. One of his big things is mixing up the speed and always finishing training runs fast.
I'm training a lot less than I was in 2009 when I got all my pb times, but my last significant race saw me do 11.2 miles @ 6.36mm which is proof that for me, less training hasn't had a detrimental effect at that distance (note I know it's very distance specific)
Bottom line I think is that for anyone who wants to compete competitively you have to pick your distance and build a training program that focuses very specifically on you. What are your strengths and weakenesses? I've noticed as all my training runs are hilly, that people who don't train on hills can't run down them very well, there's a lot of free speed to be had if you get the technique right.
Also how you run a race mentally as well as tactically all needs looking at.
I'm going to be honest (and this might upset people but it's not meant to, it's an observation), I read people's training on here sometimes and it's hugely voluminous yet they never improve their times. They are doing 'something' wrong; unless of course they don't look to improve which is fine too. 