Cycle scheme bike suitable for LEJOG

I'm looking to buy a racing bike via a cycle to work scheme that only allows you to buy from LBS so I cannot get any from the direct to buyer sellers. The major reason for doing this is that I'm cycling Land's End to John O'Groats in September in 9 days. This is a fully supported event, so I don't need to carry my own luggage. So what I'm after is a bike that will help me cover over 100 miles a day for 9 days in relative comfort, but not so slow that I don't have much time to recover.
The kind of bikes that I've been looking at and have been recommended are:
* Cube Attain SL
* Giant Contend SL 1
* Orbea Avant H30 Road Bike
So what would you recommend?
Is it worth it or should I say stuff the tax savings and pay a bit more and go for one of these:
* Canyon Endurance AL 6
* Ribble Gran Fondo Shimano 105
* Planet X Maratona
The kind of bikes that I've been looking at and have been recommended are:
* Cube Attain SL
* Giant Contend SL 1
* Orbea Avant H30 Road Bike
So what would you recommend?
Is it worth it or should I say stuff the tax savings and pay a bit more and go for one of these:
* Canyon Endurance AL 6
* Ribble Gran Fondo Shimano 105
* Planet X Maratona
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What are you riding now ? Why aren't you using that ? What do you like/dislike about it ?
I've ridden an unsupported JOGLE on a £700 Specialized Allez with a Carradice bag on the back, doing it in 8 days. I could have done it with a £200 steel bike or a £5000 carbon bike if they fit me. The essential thing for covering 100+ miles per day is that the bike and you are both in good condition and you fit together well....
Which is your LBS?