Hi all tahnks for your replies. I know what you mean about starting too fast, when the race nerves kick in and feel the pressure to stay with the pack, before I realise that as Im being overtaken by all but injuried I give up and finally accept it that there is no point trying to keep up and finally happily settle into my own pace! 
I'm hoping that my Garmin whatch will help me with my race pace, jsut the visual axpect will help a lot, but maybe I'll set an alert, Ill test if first as I dont want the beep to drive me mad.
But basically it sounds as if I should listen to my own body and keep at my pb speed and go faster towards the end if I feel up for it. Sounds good to me. It's my first 1/2 so it will be my PB regardless lol
Can I just add with another question please? I have 4 weeks till race day. This weekend gone I run my furtherst at 8m. In addition I also run twice a week with a club. Tue 5m slower- Thurs 6miles faster
How should I use my 4 following weekends till race day:
Last weekend 8m (first time)
Weekend 1 = 9m
Weekend 2= 10m
Weekend 3= Rest
Weekend 4= Race day
OR
Last weekend 8m (first time)
Weekend 1 = 10
Weekend 2= 9
Weekend 3= Rest
Weekend 4= Race day
Edited: 05/03/2012 at 17:36