Tax? Warranty? Financed? Service history (presume not)? Why on earth he's selling a brand new car on ebay of all places?
The above will help prospective buyers.
With the age of the car the majority of your questions answer themselves.
Tax - All new cars sold in the UK are advertised with first registration fee and the showroom tax. All new cars are registered with 12 months now so taking the first registration from the advert it's pretty obvious that the tax expires 09/14.
Warranty - All Ford (and most other manufacturers) cars come with a 3 year warranty. Started on the first registration date that is on the ad.
Service History - As per the first registration date and mileage it isn't due.
Financed - Yes, will be paid up on sale.
And your comments on eBay?.. Well why not? It's had a few hundred views, he's had a couple of part exchange offers through there, but sadly none are practical enough. An MX-5 is a tad too girly for a 6'7" bloke who needs to transport his girlfriend and two kids.