Cheryl,
I feel your pain, I really do! I am going through the same, and it has been hell. Here's what I did, and I recommend you trying this too, I went to this website:
http://www.ipata.com/page.php?rp=17 and found a pet shipper in my area. She was AWESOME, gave advice for free, and she spent over 2 hours on the phone with me last Friday. She really knows what she is doing!!! She asked me a zillion questions, from whether the microchip is ISO certified to the number of inches of headroom my dog has in the kennel. I scanned all of the documents I have over to her, and she already found mistakes. She also told me about rules I wasn't aware of, like the vet needs to sign the certificate in blue ink, not black. Not a big deal, and your dog wouldn't get quarantined if it was signed in black, but it could hold you up for a few hours when you arrive in the UK. She also found the following errors with my paperwork.
1. The UK needs to the see the ORIGINAL blood test results, a copy will not do.
2. Her microchip confirmation from the AKC was dated after her blood titer was drawn, even though the actual microchip was implanted before the blood titer. Basically I had no proof that her microchip was implanted before her blood titer. So I had the AKC send me a revised confirmation with a signature stating the date her microchip was implanted.
3. All sorts of rules about the kennel, the percentage that is ventilated, the amount of room the animal has, etc. The kennel I got was big enough, but needs to have holes drilled in it to be properly ventilated on all four sides.
She did all of this for free.
Once I get to Houston, I am planning on hiring her to help me finish off my paperwork and get the vet certificate. She said she would charge 30 dollars!!! The best 30 dollars I will ever spend I'm sure. She always goes to the same vet to fill out the paperwork, so this vet has now become an expert at filling out the certificate.
So try giving a professional pet shipper a call. Most likely you will find one who will give you advice for free and maybe even check all of your paperwork for free.
Good luck!!!