In reply to StefanB:
> (In reply to TheDrunkenBakers)
>
> Aim for sub 45. If you do 47.34 in training you can go below 45 in a race. Races are always faster, no matter how hard you think you have worked on a trainng run.
Races are always faster - my partner did a 10k at the weekend, and started off in a paced group with a time of 50 minutes in mind. After the first mile she felt it was all a bit too slow, so went past the pacer and carried on, and got a time of 48.06, without feeling like she'd really been pushing. Belief is part of the battle - if you think slow, you'll hold back and go slow, but if you think faster, you'll go faster (within limits, obviously).
I agree that a 45 minute time should be possible off the back of a 47.34 training run. Take the first 2-3 k sensibly but at a 4.40min/k sort of pace, and then feel good about kicking on for the rest.