MikeB,
I never really took much notice of the coaches in my old club and avoided the sessions, preferring to run hard for as long as I could round the streets with other members. However, since moving and joining a new club and doing the sessions and other training properly, I've just knocked 1:30 off my 10k PB. I had actually been slowing down over the past year or so! The reason : I was training far too hard, constantly aching, getting fatigued and basically doing myself no favours. Now, I'm training better, I never feel tired or ache, look forward to my runs and just feel great. So take note of all this Vo2max, LT and RE stuff as it does work. If you haven't got access to a measured track log onto streetmap.co.uk and print out the map of your area at 500m scale and just choose a quiet road of the right length. Then just time yourself. Good luck with your next race.