Big G - yes, race your half marathon and go for that PB and if you get it we will recalculate your training paces. In my training plans I advise racing once a month for speedwork, more race experience, pace control, and to recalculate training paces.
I know you had a rough experience in your last marathon and as long as you continue training well and on race day stick to your pre-determined marathon pace (no faster) for the first half of the race you will feel strong and you should do a good PB.
Emmy - LOL, there's non stopping you now, you'll soon be in the 100 Marathon club
S3200H - glad you're feeling OK after your bump. Camping...eek
Slowkoala - that is fast but hard to run a mile time trial on your own.
You really do need to change your forum name