Hi annieshaf; sounds like you are well on track for the half with a 10 mile long run this week. 5k is a tough distance to improve speed on off the back of long running; are you doing any speed work? Stuff like 200m up to 800m repeats, or hill repeats? Don't start on anything like that this close to the big day if you've not done them before though. My speed has improved considerably after including that kind of thing.
Sarah, I like the isotonic SiS gels, tropical is a bit bland, but orange and blackcurrant hit the spot. I usually go over the start line with 500ml of PSP22, I use that on long training runs so I know I'm putting down something I'm used to. That plus a couple of SIS gels, some sweets and whatever is being served on course is usually plenty to fend off the wall for me. Have you got a favourite sweet with a bit of zing to it? Its really worthwhile taking a few along; when you are in a bad patch the taste and memories they spark can bring you back to life.
Penguingirl, let us know how the 5k went today and your car park report! You are looking good for the big day too @ 9 miles this week. And here am I on only 10 for the full distance, tempted to go further tomorrow but better take doctor's orders! Put in a 6 mile marathon pace run this affy @ 51mins which is sub 4 hours, but, pretty sure I could not string that pace along for another 20!